./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_5_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 1dbac8bc Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_5_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan --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 c7b71b458b3f08f188a62c7539b715f43fd7f97d ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-1dbac8b [2018-11-10 09:00:45,885 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-10 09:00:45,886 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-10 09:00:45,892 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-10 09:00:45,892 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-10 09:00:45,893 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-10 09:00:45,893 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-10 09:00:45,894 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-10 09:00:45,895 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-10 09:00:45,895 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-10 09:00:45,896 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-10 09:00:45,896 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-10 09:00:45,897 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-10 09:00:45,897 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-10 09:00:45,898 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-10 09:00:45,899 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-10 09:00:45,899 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-10 09:00:45,901 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-10 09:00:45,902 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-10 09:00:45,903 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-10 09:00:45,903 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-10 09:00:45,904 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-10 09:00:45,905 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-10 09:00:45,905 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-10 09:00:45,905 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-10 09:00:45,906 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-10 09:00:45,906 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-10 09:00:45,907 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-10 09:00:45,907 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-10 09:00:45,908 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-10 09:00:45,908 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-10 09:00:45,909 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-10 09:00:45,909 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-10 09:00:45,909 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-10 09:00:45,910 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-10 09:00:45,910 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-10 09:00:45,910 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-10 09:00:45,918 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-10 09:00:45,918 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-10 09:00:45,919 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-10 09:00:45,919 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-10 09:00:45,919 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-10 09:00:45,919 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-10 09:00:45,919 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-10 09:00:45,919 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-10 09:00:45,919 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-10 09:00:45,919 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-10 09:00:45,920 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-10 09:00:45,920 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-10 09:00:45,920 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-10 09:00:45,920 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-10 09:00:45,921 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-10 09:00:45,921 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-10 09:00:45,921 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-10 09:00:45,921 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-10 09:00:45,921 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-10 09:00:45,921 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-10 09:00:45,921 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-10 09:00:45,921 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-10 09:00:45,922 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-10 09:00:45,922 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-10 09:00:45,922 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-10 09:00:45,922 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-10 09:00:45,922 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-10 09:00:45,922 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-10 09:00:45,922 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-10 09:00:45,923 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-10 09:00:45,923 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-10 09:00:45,923 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-10 09:00:45,923 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-10 09:00:45,923 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-10 09:00:45,923 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 -> /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan 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 -> c7b71b458b3f08f188a62c7539b715f43fd7f97d [2018-11-10 09:00:45,949 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-10 09:00:45,958 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-10 09:00:45,961 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-10 09:00:45,962 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-10 09:00:45,962 INFO L276 PluginConnector]: CDTParser initialized [2018-11-10 09:00:45,963 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/fibo_5_true-unreach-call_true-termination.c [2018-11-10 09:00:46,008 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/data/d499d9115/9a504aa2e4c24c51b59297e0c58d0c5f/FLAG234b1b9fa [2018-11-10 09:00:46,415 INFO L298 CDTParser]: Found 1 translation units. [2018-11-10 09:00:46,416 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/sv-benchmarks/c/recursive-simple/fibo_5_true-unreach-call_true-termination.c [2018-11-10 09:00:46,420 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/data/d499d9115/9a504aa2e4c24c51b59297e0c58d0c5f/FLAG234b1b9fa [2018-11-10 09:00:46,429 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/data/d499d9115/9a504aa2e4c24c51b59297e0c58d0c5f [2018-11-10 09:00:46,431 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-10 09:00:46,432 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-10 09:00:46,433 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-10 09:00:46,433 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-10 09:00:46,436 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-10 09:00:46,437 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,439 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56be32e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46, skipping insertion in model container [2018-11-10 09:00:46,439 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,448 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-10 09:00:46,461 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-10 09:00:46,558 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-10 09:00:46,560 INFO L189 MainTranslator]: Completed pre-run [2018-11-10 09:00:46,570 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-10 09:00:46,580 INFO L193 MainTranslator]: Completed translation [2018-11-10 09:00:46,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46 WrapperNode [2018-11-10 09:00:46,580 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-10 09:00:46,580 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-10 09:00:46,580 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-10 09:00:46,581 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-10 09:00:46,586 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,589 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,592 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-10 09:00:46,592 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-10 09:00:46,592 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-10 09:00:46,592 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-10 09:00:46,597 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,597 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,598 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,598 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,599 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,601 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,601 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... [2018-11-10 09:00:46,602 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-10 09:00:46,602 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-10 09:00:46,602 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-10 09:00:46,602 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-10 09:00:46,603 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/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 [2018-11-10 09:00:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-10 09:00:46,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-10 09:00:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-10 09:00:46,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-10 09:00:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-10 09:00:46,673 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-10 09:00:46,674 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2018-11-10 09:00:46,674 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2018-11-10 09:00:46,774 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-10 09:00:46,774 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 09:00:46 BoogieIcfgContainer [2018-11-10 09:00:46,774 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-10 09:00:46,775 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-10 09:00:46,775 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-10 09:00:46,778 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-10 09:00:46,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.11 09:00:46" (1/3) ... [2018-11-10 09:00:46,778 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75a685f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.11 09:00:46, skipping insertion in model container [2018-11-10 09:00:46,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 09:00:46" (2/3) ... [2018-11-10 09:00:46,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75a685f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.11 09:00:46, skipping insertion in model container [2018-11-10 09:00:46,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 09:00:46" (3/3) ... [2018-11-10 09:00:46,780 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_5_true-unreach-call_true-termination.c [2018-11-10 09:00:46,787 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-10 09:00:46,792 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-10 09:00:46,800 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-10 09:00:46,824 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-10 09:00:46,824 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-10 09:00:46,824 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-10 09:00:46,824 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-10 09:00:46,824 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-10 09:00:46,825 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-10 09:00:46,825 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-10 09:00:46,825 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-10 09:00:46,839 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2018-11-10 09:00:46,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-10 09:00:46,843 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:46,844 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:46,846 INFO L424 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:46,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:46,850 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2018-11-10 09:00:46,851 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:46,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:46,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 09:00:46,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:46,886 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:46,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:46,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 09:00:46,965 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-10 09:00:46,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-10 09:00:46,966 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-10 09:00:46,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-10 09:00:46,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-10 09:00:46,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-10 09:00:46,983 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2018-11-10 09:00:47,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:47,063 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-11-10 09:00:47,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-10 09:00:47,064 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-10 09:00:47,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:47,070 INFO L225 Difference]: With dead ends: 35 [2018-11-10 09:00:47,070 INFO L226 Difference]: Without dead ends: 21 [2018-11-10 09:00:47,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-10 09:00:47,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-10 09:00:47,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-10 09:00:47,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-10 09:00:47,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2018-11-10 09:00:47,097 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2018-11-10 09:00:47,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:47,097 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2018-11-10 09:00:47,098 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-10 09:00:47,098 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2018-11-10 09:00:47,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-10 09:00:47,099 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:47,099 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:47,099 INFO L424 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:47,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:47,100 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2018-11-10 09:00:47,100 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:47,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:47,101 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 09:00:47,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:47,101 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:47,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:47,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 09:00:47,135 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-10 09:00:47,135 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-10 09:00:47,136 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-10 09:00:47,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-10 09:00:47,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-10 09:00:47,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-10 09:00:47,137 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2018-11-10 09:00:47,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:47,198 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2018-11-10 09:00:47,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-10 09:00:47,199 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-11-10 09:00:47,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:47,199 INFO L225 Difference]: With dead ends: 27 [2018-11-10 09:00:47,200 INFO L226 Difference]: Without dead ends: 23 [2018-11-10 09:00:47,200 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-10 09:00:47,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-11-10 09:00:47,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2018-11-10 09:00:47,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-10 09:00:47,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2018-11-10 09:00:47,211 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2018-11-10 09:00:47,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:47,211 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2018-11-10 09:00:47,211 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-10 09:00:47,212 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2018-11-10 09:00:47,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-10 09:00:47,212 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:47,212 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:47,213 INFO L424 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:47,213 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:47,213 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2018-11-10 09:00:47,213 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:47,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:47,214 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 09:00:47,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:47,214 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:47,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:47,282 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-10 09:00:47,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:47,282 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:47,283 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 27 with the following transitions: [2018-11-10 09:00:47,284 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [26], [28], [30], [31], [32], [33], [34], [36], [37], [38], [39], [40], [41] [2018-11-10 09:00:47,319 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-10 09:00:47,319 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-10 09:00:47,421 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-11-10 09:00:47,422 INFO L272 AbstractInterpreter]: Visited 11 different actions 35 times. Never merged. Widened at 1 different actions 2 times. Never found a fixpoint. Largest state had 5 variables. [2018-11-10 09:00:47,426 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:47,427 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-11-10 09:00:47,462 INFO L227 lantSequenceWeakener]: Weakened 4 states. On average, predicates are now at 50% of their original sizes. [2018-11-10 09:00:47,462 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-11-10 09:00:47,505 INFO L415 sIntCurrentIteration]: We unified 25 AI predicates to 25 [2018-11-10 09:00:47,505 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-11-10 09:00:47,506 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-11-10 09:00:47,506 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2018-11-10 09:00:47,506 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-10 09:00:47,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-10 09:00:47,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-10 09:00:47,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-11-10 09:00:47,507 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 7 states. [2018-11-10 09:00:47,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:47,699 INFO L93 Difference]: Finished difference Result 54 states and 72 transitions. [2018-11-10 09:00:47,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-10 09:00:47,699 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2018-11-10 09:00:47,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:47,700 INFO L225 Difference]: With dead ends: 54 [2018-11-10 09:00:47,700 INFO L226 Difference]: Without dead ends: 39 [2018-11-10 09:00:47,701 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2018-11-10 09:00:47,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-10 09:00:47,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2018-11-10 09:00:47,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-10 09:00:47,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2018-11-10 09:00:47,709 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 26 [2018-11-10 09:00:47,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:47,709 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2018-11-10 09:00:47,709 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-10 09:00:47,710 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2018-11-10 09:00:47,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-10 09:00:47,711 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:47,712 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:47,712 INFO L424 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:47,712 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:47,712 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2018-11-10 09:00:47,712 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:47,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:47,713 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 09:00:47,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:47,713 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:47,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:47,771 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2018-11-10 09:00:47,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:47,771 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:47,771 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 09:00:47,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 09:00:47,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:47,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/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 [2018-11-10 09:00:47,781 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 09:00:47,781 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 09:00:47,795 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-10 09:00:47,795 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 09:00:47,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 09:00:47,836 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-11-10 09:00:47,836 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 09:00:48,058 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-11-10 09:00:48,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 09:00:48,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 11 [2018-11-10 09:00:48,076 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 09:00:48,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-10 09:00:48,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-10 09:00:48,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-11-10 09:00:48,077 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 8 states. [2018-11-10 09:00:48,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:48,153 INFO L93 Difference]: Finished difference Result 73 states and 99 transitions. [2018-11-10 09:00:48,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-10 09:00:48,155 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 39 [2018-11-10 09:00:48,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:48,156 INFO L225 Difference]: With dead ends: 73 [2018-11-10 09:00:48,156 INFO L226 Difference]: Without dead ends: 47 [2018-11-10 09:00:48,156 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=171, Unknown=0, NotChecked=0, Total=240 [2018-11-10 09:00:48,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-11-10 09:00:48,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2018-11-10 09:00:48,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-10 09:00:48,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2018-11-10 09:00:48,164 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 39 [2018-11-10 09:00:48,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:48,165 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2018-11-10 09:00:48,165 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-10 09:00:48,165 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2018-11-10 09:00:48,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-10 09:00:48,166 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:48,166 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:48,166 INFO L424 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:48,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:48,167 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 1 times [2018-11-10 09:00:48,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:48,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:48,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 09:00:48,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:48,168 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:48,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:48,221 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 8 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-10 09:00:48,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:48,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:48,222 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 42 with the following transitions: [2018-11-10 09:00:48,222 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [25], [26], [28], [30], [31], [32], [33], [34], [36], [37], [38], [39], [40], [41] [2018-11-10 09:00:48,225 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-10 09:00:48,225 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-10 09:00:48,323 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-11-10 09:00:48,323 INFO L272 AbstractInterpreter]: Visited 21 different actions 153 times. Merged at 2 different actions 2 times. Widened at 1 different actions 2 times. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-11-10 09:00:48,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:48,326 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-11-10 09:00:48,376 INFO L227 lantSequenceWeakener]: Weakened 29 states. On average, predicates are now at 45.69% of their original sizes. [2018-11-10 09:00:48,377 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-11-10 09:00:48,626 INFO L415 sIntCurrentIteration]: We unified 40 AI predicates to 40 [2018-11-10 09:00:48,627 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-11-10 09:00:48,627 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-11-10 09:00:48,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [22] imperfect sequences [6] total 26 [2018-11-10 09:00:48,627 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-10 09:00:48,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-10 09:00:48,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-10 09:00:48,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=413, Unknown=0, NotChecked=0, Total=462 [2018-11-10 09:00:48,628 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 22 states. [2018-11-10 09:00:49,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:49,457 INFO L93 Difference]: Finished difference Result 82 states and 105 transitions. [2018-11-10 09:00:49,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-10 09:00:49,457 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 41 [2018-11-10 09:00:49,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:49,458 INFO L225 Difference]: With dead ends: 82 [2018-11-10 09:00:49,458 INFO L226 Difference]: Without dead ends: 57 [2018-11-10 09:00:49,459 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 44 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=585, Unknown=0, NotChecked=0, Total=650 [2018-11-10 09:00:49,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-10 09:00:49,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-10 09:00:49,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-10 09:00:49,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 66 transitions. [2018-11-10 09:00:49,467 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 66 transitions. Word has length 41 [2018-11-10 09:00:49,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:49,467 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 66 transitions. [2018-11-10 09:00:49,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-10 09:00:49,467 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 66 transitions. [2018-11-10 09:00:49,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-11-10 09:00:49,469 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:49,469 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 10, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:49,469 INFO L424 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:49,470 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:49,470 INFO L82 PathProgramCache]: Analyzing trace with hash 450721402, now seen corresponding path program 2 times [2018-11-10 09:00:49,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:49,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:49,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 09:00:49,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:49,471 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:49,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:49,563 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 85 proven. 120 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2018-11-10 09:00:49,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:49,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:49,564 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 09:00:49,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 09:00:49,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:49,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 09:00:49,570 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 09:00:49,570 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 09:00:49,587 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-10 09:00:49,587 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 09:00:49,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 09:00:49,620 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 202 proven. 12 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2018-11-10 09:00:49,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 09:00:49,874 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 202 proven. 14 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2018-11-10 09:00:49,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 09:00:49,890 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 14 [2018-11-10 09:00:49,890 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 09:00:49,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-10 09:00:49,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-10 09:00:49,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2018-11-10 09:00:49,891 INFO L87 Difference]: Start difference. First operand 57 states and 66 transitions. Second operand 11 states. [2018-11-10 09:00:49,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:49,994 INFO L93 Difference]: Finished difference Result 114 states and 160 transitions. [2018-11-10 09:00:49,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-10 09:00:49,997 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 107 [2018-11-10 09:00:49,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:49,998 INFO L225 Difference]: With dead ends: 114 [2018-11-10 09:00:49,998 INFO L226 Difference]: Without dead ends: 71 [2018-11-10 09:00:49,998 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 203 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=106, Invalid=236, Unknown=0, NotChecked=0, Total=342 [2018-11-10 09:00:49,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-11-10 09:00:50,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 65. [2018-11-10 09:00:50,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-11-10 09:00:50,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 81 transitions. [2018-11-10 09:00:50,007 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 81 transitions. Word has length 107 [2018-11-10 09:00:50,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:50,007 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 81 transitions. [2018-11-10 09:00:50,007 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-10 09:00:50,007 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 81 transitions. [2018-11-10 09:00:50,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-10 09:00:50,009 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:50,009 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:50,009 INFO L424 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:50,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:50,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 3 times [2018-11-10 09:00:50,010 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:50,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:50,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 09:00:50,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:50,011 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:50,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:50,206 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2018-11-10 09:00:50,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:50,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:50,206 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 09:00:50,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 09:00:50,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:50,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/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 [2018-11-10 09:00:50,212 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 09:00:50,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 09:00:50,231 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 09:00:50,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 09:00:50,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 09:00:50,351 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2018-11-10 09:00:50,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 09:00:50,738 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2018-11-10 09:00:50,754 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 09:00:50,754 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 20 [2018-11-10 09:00:50,754 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 09:00:50,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-10 09:00:50,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-10 09:00:50,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2018-11-10 09:00:50,755 INFO L87 Difference]: Start difference. First operand 65 states and 81 transitions. Second operand 20 states. [2018-11-10 09:00:50,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:50,971 INFO L93 Difference]: Finished difference Result 154 states and 268 transitions. [2018-11-10 09:00:50,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-10 09:00:50,972 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 109 [2018-11-10 09:00:50,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:50,975 INFO L225 Difference]: With dead ends: 154 [2018-11-10 09:00:50,975 INFO L226 Difference]: Without dead ends: 147 [2018-11-10 09:00:50,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 214 SyntacticMatches, 18 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=409, Unknown=0, NotChecked=0, Total=462 [2018-11-10 09:00:50,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-11-10 09:00:51,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 83. [2018-11-10 09:00:51,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-10 09:00:51,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 113 transitions. [2018-11-10 09:00:51,005 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 113 transitions. Word has length 109 [2018-11-10 09:00:51,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:51,006 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 113 transitions. [2018-11-10 09:00:51,006 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-10 09:00:51,006 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 113 transitions. [2018-11-10 09:00:51,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-11-10 09:00:51,008 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:51,008 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 15, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:51,008 INFO L424 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:51,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:51,009 INFO L82 PathProgramCache]: Analyzing trace with hash -2129879385, now seen corresponding path program 4 times [2018-11-10 09:00:51,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:51,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:51,009 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 09:00:51,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:51,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:51,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:51,076 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 129 proven. 104 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2018-11-10 09:00:51,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:51,076 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:51,076 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 09:00:51,076 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 09:00:51,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:51,076 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 09:00:51,082 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 09:00:51,082 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 09:00:51,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:51,115 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 09:00:51,215 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 120 proven. 162 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2018-11-10 09:00:51,216 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 09:00:51,517 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 124 proven. 172 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2018-11-10 09:00:51,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 09:00:51,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 11] total 15 [2018-11-10 09:00:51,533 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 09:00:51,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-10 09:00:51,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-10 09:00:51,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2018-11-10 09:00:51,534 INFO L87 Difference]: Start difference. First operand 83 states and 113 transitions. Second operand 11 states. [2018-11-10 09:00:51,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:51,680 INFO L93 Difference]: Finished difference Result 207 states and 357 transitions. [2018-11-10 09:00:51,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-10 09:00:51,680 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 124 [2018-11-10 09:00:51,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:51,681 INFO L225 Difference]: With dead ends: 207 [2018-11-10 09:00:51,682 INFO L226 Difference]: Without dead ends: 93 [2018-11-10 09:00:51,683 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 232 SyntacticMatches, 9 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=148, Invalid=358, Unknown=0, NotChecked=0, Total=506 [2018-11-10 09:00:51,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-10 09:00:51,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 83. [2018-11-10 09:00:51,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-10 09:00:51,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 100 transitions. [2018-11-10 09:00:51,691 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 100 transitions. Word has length 124 [2018-11-10 09:00:51,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:51,692 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 100 transitions. [2018-11-10 09:00:51,692 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-10 09:00:51,692 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 100 transitions. [2018-11-10 09:00:51,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-11-10 09:00:51,693 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:51,693 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 14, 8, 8, 8, 8, 8, 8, 8, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:51,693 INFO L424 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:51,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:51,694 INFO L82 PathProgramCache]: Analyzing trace with hash -19418837, now seen corresponding path program 5 times [2018-11-10 09:00:51,694 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:51,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:51,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 09:00:51,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:51,694 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:51,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:51,772 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 261 proven. 28 refuted. 0 times theorem prover too weak. 458 trivial. 0 not checked. [2018-11-10 09:00:51,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:51,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:51,773 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 09:00:51,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 09:00:51,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:51,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/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 [2018-11-10 09:00:51,778 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 09:00:51,778 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-10 09:00:51,791 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-10 09:00:51,791 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 09:00:51,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 09:00:51,819 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 251 proven. 17 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2018-11-10 09:00:51,820 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 09:00:52,034 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 251 proven. 18 refuted. 0 times theorem prover too weak. 478 trivial. 0 not checked. [2018-11-10 09:00:52,050 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 09:00:52,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 9] total 15 [2018-11-10 09:00:52,051 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 09:00:52,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-10 09:00:52,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-10 09:00:52,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2018-11-10 09:00:52,052 INFO L87 Difference]: Start difference. First operand 83 states and 100 transitions. Second operand 12 states. [2018-11-10 09:00:52,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:52,150 INFO L93 Difference]: Finished difference Result 167 states and 210 transitions. [2018-11-10 09:00:52,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-10 09:00:52,150 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 123 [2018-11-10 09:00:52,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:52,151 INFO L225 Difference]: With dead ends: 167 [2018-11-10 09:00:52,151 INFO L226 Difference]: Without dead ends: 105 [2018-11-10 09:00:52,152 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 236 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=142, Invalid=320, Unknown=0, NotChecked=0, Total=462 [2018-11-10 09:00:52,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-10 09:00:52,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 90. [2018-11-10 09:00:52,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-10 09:00:52,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 108 transitions. [2018-11-10 09:00:52,161 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 108 transitions. Word has length 123 [2018-11-10 09:00:52,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:52,162 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 108 transitions. [2018-11-10 09:00:52,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-10 09:00:52,162 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 108 transitions. [2018-11-10 09:00:52,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-11-10 09:00:52,163 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:52,163 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:52,163 INFO L424 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:52,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:52,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 6 times [2018-11-10 09:00:52,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:52,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:52,164 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 09:00:52,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:52,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:52,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:52,253 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 241 proven. 102 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2018-11-10 09:00:52,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:52,254 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:52,254 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 09:00:52,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 09:00:52,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:52,254 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 09:00:52,268 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 09:00:52,269 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-10 09:00:52,287 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 09:00:52,287 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 09:00:52,289 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 09:00:52,323 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 243 proven. 97 refuted. 0 times theorem prover too weak. 593 trivial. 0 not checked. [2018-11-10 09:00:52,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 09:00:52,675 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 240 proven. 112 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-11-10 09:00:52,691 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 09:00:52,691 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 12] total 17 [2018-11-10 09:00:52,691 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 09:00:52,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-10 09:00:52,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-10 09:00:52,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=187, Unknown=0, NotChecked=0, Total=272 [2018-11-10 09:00:52,692 INFO L87 Difference]: Start difference. First operand 90 states and 108 transitions. Second operand 12 states. [2018-11-10 09:00:52,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:52,753 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2018-11-10 09:00:52,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-10 09:00:52,754 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 136 [2018-11-10 09:00:52,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:52,754 INFO L225 Difference]: With dead ends: 106 [2018-11-10 09:00:52,754 INFO L226 Difference]: Without dead ends: 89 [2018-11-10 09:00:52,755 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 259 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2018-11-10 09:00:52,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-11-10 09:00:52,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 83. [2018-11-10 09:00:52,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-10 09:00:52,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 96 transitions. [2018-11-10 09:00:52,761 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 96 transitions. Word has length 136 [2018-11-10 09:00:52,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:52,761 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 96 transitions. [2018-11-10 09:00:52,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-10 09:00:52,762 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 96 transitions. [2018-11-10 09:00:52,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-11-10 09:00:52,763 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 09:00:52,763 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 09:00:52,763 INFO L424 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 09:00:52,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 09:00:52,764 INFO L82 PathProgramCache]: Analyzing trace with hash -344605238, now seen corresponding path program 7 times [2018-11-10 09:00:52,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 09:00:52,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:52,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 09:00:52,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 09:00:52,765 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 09:00:52,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:52,887 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 127 proven. 275 refuted. 0 times theorem prover too weak. 531 trivial. 0 not checked. [2018-11-10 09:00:52,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:52,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 09:00:52,888 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-10 09:00:52,888 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-10 09:00:52,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 09:00:52,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/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 [2018-11-10 09:00:52,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 09:00:52,896 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 09:00:52,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 09:00:52,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 09:00:52,946 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 135 proven. 263 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2018-11-10 09:00:52,946 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 09:00:53,475 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 131 proven. 289 refuted. 0 times theorem prover too weak. 513 trivial. 0 not checked. [2018-11-10 09:00:53,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 09:00:53,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 14] total 19 [2018-11-10 09:00:53,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 09:00:53,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-10 09:00:53,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-10 09:00:53,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2018-11-10 09:00:53,492 INFO L87 Difference]: Start difference. First operand 83 states and 96 transitions. Second operand 13 states. [2018-11-10 09:00:53,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 09:00:53,556 INFO L93 Difference]: Finished difference Result 124 states and 147 transitions. [2018-11-10 09:00:53,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-10 09:00:53,557 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2018-11-10 09:00:53,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 09:00:53,557 INFO L225 Difference]: With dead ends: 124 [2018-11-10 09:00:53,558 INFO L226 Difference]: Without dead ends: 0 [2018-11-10 09:00:53,559 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 257 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=176, Invalid=330, Unknown=0, NotChecked=0, Total=506 [2018-11-10 09:00:53,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-10 09:00:53,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-10 09:00:53,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-10 09:00:53,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-10 09:00:53,559 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 136 [2018-11-10 09:00:53,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 09:00:53,559 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-10 09:00:53,559 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-10 09:00:53,559 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-10 09:00:53,559 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-10 09:00:53,565 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-10 09:00:53,875 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-10 09:00:53,883 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-10 09:00:53,885 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-10 09:00:53,893 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-10 09:00:53,895 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-10 09:00:54,341 WARN L179 SmtUtils]: Spent 380.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 35 [2018-11-10 09:00:54,437 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-10 09:00:54,437 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-10 09:00:54,437 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-10 09:00:54,437 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-10 09:00:54,437 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-10 09:00:54,437 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-10 09:00:54,437 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point L27(line 27) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point L26(lines 26 28) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L421 ceAbstractionStarter]: At program point L25(line 25) the Hoare annotation is: (and (<= 5 main_~x~0) (<= main_~x~0 5)) [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point L25-1(line 25) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L421 ceAbstractionStarter]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (< 1 fibo_~n)) [2018-11-10 09:00:54,438 INFO L425 ceAbstractionStarter]: For program point L11-1(line 11) no Hoare annotation was computed. [2018-11-10 09:00:54,438 INFO L421 ceAbstractionStarter]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse0 (* 2 |fibo_#in~n|))) (and (or (and (<= 2 |fibo_#t~ret0|) (<= |fibo_#t~ret0| 2)) (not (= |fibo_#in~n| 4))) (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (or (and (<= |fibo_#t~ret0| 1) (<= 1 |fibo_#t~ret0|)) (< 6 .cse0)) (or (< .cse0 10) (and (<= 3 |fibo_#t~ret0|) (<= |fibo_#t~ret0| 3)) (< 10 .cse0)) (< 1 fibo_~n))) [2018-11-10 09:00:54,439 INFO L425 ceAbstractionStarter]: For program point L8(lines 8 12) no Hoare annotation was computed. [2018-11-10 09:00:54,439 INFO L425 ceAbstractionStarter]: For program point L11-3(line 11) no Hoare annotation was computed. [2018-11-10 09:00:54,439 INFO L425 ceAbstractionStarter]: For program point L6(lines 6 12) no Hoare annotation was computed. [2018-11-10 09:00:54,439 INFO L428 ceAbstractionStarter]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2018-11-10 09:00:54,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.11 09:00:54 BoogieIcfgContainer [2018-11-10 09:00:54,441 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-10 09:00:54,441 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-10 09:00:54,441 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-10 09:00:54,441 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-10 09:00:54,442 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 09:00:46" (3/4) ... [2018-11-10 09:00:54,449 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-10 09:00:54,453 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-10 09:00:54,453 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-10 09:00:54,454 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo [2018-11-10 09:00:54,456 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-10 09:00:54,456 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-11-10 09:00:54,457 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-10 09:00:54,488 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_dc6c4f15-38f3-470f-91a9-bb8b25ee4733/bin-2019/utaipan/witness.graphml [2018-11-10 09:00:54,489 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-10 09:00:54,489 INFO L168 Benchmark]: Toolchain (without parser) took 8057.72 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 289.4 MB). Free memory was 961.9 MB in the beginning and 1.1 GB in the end (delta: -162.6 MB). Peak memory consumption was 126.8 MB. Max. memory is 11.5 GB. [2018-11-10 09:00:54,490 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 982.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 09:00:54,490 INFO L168 Benchmark]: CACSL2BoogieTranslator took 147.29 ms. Allocated memory is still 1.0 GB. Free memory was 961.9 MB in the beginning and 951.2 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-10 09:00:54,491 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.44 ms. Allocated memory is still 1.0 GB. Free memory is still 951.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 09:00:54,491 INFO L168 Benchmark]: Boogie Preprocessor took 10.05 ms. Allocated memory is still 1.0 GB. Free memory is still 951.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 09:00:54,491 INFO L168 Benchmark]: RCFGBuilder took 172.41 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.1 MB). Free memory was 951.2 MB in the beginning and 1.1 GB in the end (delta: -168.6 MB). Peak memory consumption was 25.4 MB. Max. memory is 11.5 GB. [2018-11-10 09:00:54,491 INFO L168 Benchmark]: TraceAbstraction took 7665.59 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 157.3 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -13.5 MB). Peak memory consumption was 367.4 MB. Max. memory is 11.5 GB. [2018-11-10 09:00:54,492 INFO L168 Benchmark]: Witness Printer took 47.56 ms. Allocated memory is still 1.3 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 8.7 MB). Peak memory consumption was 8.7 MB. Max. memory is 11.5 GB. [2018-11-10 09:00:54,493 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 982.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 147.29 ms. Allocated memory is still 1.0 GB. Free memory was 961.9 MB in the beginning and 951.2 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 11.44 ms. Allocated memory is still 1.0 GB. Free memory is still 951.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.05 ms. Allocated memory is still 1.0 GB. Free memory is still 951.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 172.41 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.1 MB). Free memory was 951.2 MB in the beginning and 1.1 GB in the end (delta: -168.6 MB). Peak memory consumption was 25.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 7665.59 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 157.3 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -13.5 MB). Peak memory consumption was 367.4 MB. Max. memory is 11.5 GB. * Witness Printer took 47.56 ms. Allocated memory is still 1.3 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 8.7 MB). Peak memory consumption was 8.7 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. SAFE Result, 7.6s OverallTime, 11 OverallIterations, 19 TraceHistogramMax, 1.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.8s HoareAnnotationTime, HoareTripleCheckerStatistics: 289 SDtfs, 240 SDslu, 1494 SDs, 0 SdLazy, 1279 SolverSat, 186 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 4 DeclaredPredicates, 1754 GetRequests, 1516 SyntacticMatches, 68 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 1.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=90occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 2 AbstIntIterations, 2 AbstIntStrong, 0.9138461538461533 AbsIntWeakeningRatio, 0.5538461538461539 AbsIntAvgWeakeningVarsNumRemoved, 5.2615384615384615 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 11 MinimizatonAttempts, 113 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 227 PreInvPairs, 460 NumberOfFragments, 79 HoareAnnotationTreeSize, 227 FomulaSimplifications, 26833 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 8 FomulaSimplificationsInter, 4116 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.4s InterpolantComputationTime, 1642 NumberOfCodeBlocks, 1485 NumberOfCodeBlocksAsserted, 31 NumberOfCheckSat, 2391 ConstructedInterpolants, 0 QuantifiedInterpolants, 535749 SizeOfPredicates, 30 NumberOfNonLiveVariables, 1361 ConjunctsInSsa, 119 ConjunctsInUnsatCore, 25 InterpolantComputations, 2 PerfectInterpolantSequences, 11302/13676 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...