./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/sum_15x0_false-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_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_15x0_false-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 31319b3dce926b7eddaa50d24c240f6870931f21 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-1dbac8b [2018-10-26 19:15:51,935 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-26 19:15:51,936 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-26 19:15:51,947 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-26 19:15:51,947 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-26 19:15:51,948 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-26 19:15:51,949 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-26 19:15:51,951 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-26 19:15:51,952 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-26 19:15:51,953 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-26 19:15:51,954 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-26 19:15:51,954 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-26 19:15:51,955 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-26 19:15:51,956 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-26 19:15:51,957 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-26 19:15:51,958 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-26 19:15:51,959 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-26 19:15:51,961 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-26 19:15:51,962 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-26 19:15:51,964 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-26 19:15:51,964 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-26 19:15:51,966 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-26 19:15:51,968 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-26 19:15:51,968 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-26 19:15:51,968 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-26 19:15:51,969 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-26 19:15:51,970 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-26 19:15:51,971 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-26 19:15:51,972 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-26 19:15:51,972 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-26 19:15:51,973 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-26 19:15:51,974 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-26 19:15:51,974 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-26 19:15:51,974 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-26 19:15:51,975 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-26 19:15:51,975 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-26 19:15:51,976 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-26 19:15:51,988 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-26 19:15:51,989 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-26 19:15:51,990 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-26 19:15:51,990 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-26 19:15:51,990 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-26 19:15:51,990 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-26 19:15:51,990 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-26 19:15:51,991 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-26 19:15:51,991 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-26 19:15:51,991 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-26 19:15:51,991 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-26 19:15:51,992 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-26 19:15:51,992 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-26 19:15:51,992 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-26 19:15:51,992 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-26 19:15:51,992 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-26 19:15:51,992 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-26 19:15:51,993 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-26 19:15:51,993 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-26 19:15:51,993 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-26 19:15:51,993 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-26 19:15:51,995 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-26 19:15:51,995 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-26 19:15:51,995 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-26 19:15:51,996 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-26 19:15:51,996 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-26 19:15:51,996 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 19:15:51,996 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-26 19:15:51,996 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-26 19:15:51,996 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-26 19:15:51,996 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-26 19:15:51,997 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-26 19:15:51,997 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-26 19:15:51,997 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-26 19:15:51,997 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_55feaf95-990f-462e-be60-38f05fc77c9c/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 -> 31319b3dce926b7eddaa50d24c240f6870931f21 [2018-10-26 19:15:52,026 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 19:15:52,037 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 19:15:52,040 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 19:15:52,042 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 19:15:52,042 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 19:15:52,043 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/sum_15x0_false-unreach-call_true-termination.c [2018-10-26 19:15:52,111 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/data/c9439cdee/b16a0824fea04298ad98713781e9abac/FLAGe681411c4 [2018-10-26 19:15:52,478 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 19:15:52,479 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/sv-benchmarks/c/recursive-simple/sum_15x0_false-unreach-call_true-termination.c [2018-10-26 19:15:52,487 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/data/c9439cdee/b16a0824fea04298ad98713781e9abac/FLAGe681411c4 [2018-10-26 19:15:52,498 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/data/c9439cdee/b16a0824fea04298ad98713781e9abac [2018-10-26 19:15:52,501 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 19:15:52,502 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-26 19:15:52,503 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 19:15:52,503 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 19:15:52,507 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 19:15:52,508 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,510 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@146f90bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52, skipping insertion in model container [2018-10-26 19:15:52,510 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,520 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 19:15:52,535 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 19:15:52,685 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 19:15:52,689 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 19:15:52,702 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 19:15:52,715 INFO L193 MainTranslator]: Completed translation [2018-10-26 19:15:52,715 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52 WrapperNode [2018-10-26 19:15:52,715 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 19:15:52,716 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-26 19:15:52,716 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-26 19:15:52,716 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-26 19:15:52,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,730 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,735 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-26 19:15:52,735 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 19:15:52,735 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 19:15:52,735 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 19:15:52,744 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,745 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,745 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,747 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,749 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,750 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... [2018-10-26 19:15:52,751 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 19:15:52,752 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 19:15:52,752 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 19:15:52,752 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 19:15:52,753 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 [2018-10-26 19:15:52,903 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-26 19:15:52,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-26 19:15:52,903 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 19:15:52,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 19:15:52,903 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-26 19:15:52,903 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-26 19:15:52,904 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-10-26 19:15:52,904 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-10-26 19:15:53,221 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 19:15:53,222 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:15:53 BoogieIcfgContainer [2018-10-26 19:15:53,222 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 19:15:53,223 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 19:15:53,223 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 19:15:53,227 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 19:15:53,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 07:15:52" (1/3) ... [2018-10-26 19:15:53,228 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78b9baa2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 07:15:53, skipping insertion in model container [2018-10-26 19:15:53,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:15:52" (2/3) ... [2018-10-26 19:15:53,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78b9baa2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 07:15:53, skipping insertion in model container [2018-10-26 19:15:53,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:15:53" (3/3) ... [2018-10-26 19:15:53,231 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_15x0_false-unreach-call_true-termination.c [2018-10-26 19:15:53,242 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 19:15:53,250 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 19:15:53,277 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 19:15:53,313 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 19:15:53,314 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 19:15:53,314 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 19:15:53,314 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 19:15:53,314 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 19:15:53,314 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 19:15:53,314 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 19:15:53,314 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 19:15:53,331 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-26 19:15:53,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-26 19:15:53,337 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:15:53,337 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:15:53,339 INFO L424 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:15:53,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:15:53,345 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-10-26 19:15:53,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:15:53,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:53,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:15:53,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:53,433 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:15:53,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:53,692 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:15:53,693 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 19:15:53,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-26 19:15:53,694 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 19:15:53,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-26 19:15:53,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-26 19:15:53,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-26 19:15:53,709 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-10-26 19:15:53,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:15:53,877 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-10-26 19:15:53,877 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-26 19:15:53,879 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-10-26 19:15:53,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:15:53,889 INFO L225 Difference]: With dead ends: 30 [2018-10-26 19:15:53,889 INFO L226 Difference]: Without dead ends: 18 [2018-10-26 19:15:53,895 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-26 19:15:53,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-26 19:15:53,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-26 19:15:53,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-26 19:15:53,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-26 19:15:53,940 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-26 19:15:53,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:15:53,940 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-26 19:15:53,940 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-26 19:15:53,941 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-26 19:15:53,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-26 19:15:53,943 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:15:53,943 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:15:53,944 INFO L424 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:15:53,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:15:53,944 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-10-26 19:15:53,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:15:53,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:53,946 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:15:53,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:53,947 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:15:53,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:54,040 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:15:54,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:54,040 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:15:54,041 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-26 19:15:54,043 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-10-26 19:15:54,089 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-26 19:15:54,089 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-26 19:15:54,323 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-26 19:15:54,324 INFO L272 AbstractInterpreter]: Visited 17 different actions 71 times. Never merged. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 6 variables. [2018-10-26 19:15:54,362 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:15:54,363 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-26 19:15:54,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:54,363 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 [2018-10-26 19:15:54,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:15:54,371 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:15:54,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:54,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:15:54,441 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:15:54,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:15:54,886 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-26 19:15:54,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:15:54,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-10-26 19:15:54,905 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:15:54,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-26 19:15:54,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-26 19:15:54,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-10-26 19:15:54,907 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-10-26 19:15:55,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:15:55,034 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-10-26 19:15:55,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-26 19:15:55,035 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-26 19:15:55,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:15:55,036 INFO L225 Difference]: With dead ends: 25 [2018-10-26 19:15:55,036 INFO L226 Difference]: Without dead ends: 21 [2018-10-26 19:15:55,037 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-10-26 19:15:55,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-26 19:15:55,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-26 19:15:55,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-26 19:15:55,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-26 19:15:55,046 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-10-26 19:15:55,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:15:55,049 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-26 19:15:55,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-26 19:15:55,051 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-26 19:15:55,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-26 19:15:55,052 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:15:55,052 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:15:55,052 INFO L424 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:15:55,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:15:55,053 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-10-26 19:15:55,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:15:55,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:55,054 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:15:55,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:55,054 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:15:55,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:55,263 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:15:55,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:55,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:15:55,264 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:15:55,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:15:55,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:55,265 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 [2018-10-26 19:15:55,279 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:15:55,279 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:15:55,303 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-26 19:15:55,304 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:15:55,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:15:55,323 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:15:55,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:15:55,569 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-26 19:15:55,686 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-26 19:15:55,988 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-26 19:15:56,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:15:56,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-10-26 19:15:56,015 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:15:56,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 19:15:56,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 19:15:56,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-10-26 19:15:56,016 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-10-26 19:15:56,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:15:56,150 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-10-26 19:15:56,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 19:15:56,150 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-10-26 19:15:56,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:15:56,151 INFO L225 Difference]: With dead ends: 28 [2018-10-26 19:15:56,151 INFO L226 Difference]: Without dead ends: 24 [2018-10-26 19:15:56,152 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-10-26 19:15:56,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-26 19:15:56,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-26 19:15:56,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-26 19:15:56,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-26 19:15:56,157 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-10-26 19:15:56,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:15:56,158 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-26 19:15:56,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 19:15:56,158 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-26 19:15:56,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-26 19:15:56,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:15:56,159 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:15:56,159 INFO L424 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:15:56,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:15:56,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-10-26 19:15:56,160 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:15:56,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:56,161 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:15:56,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:56,161 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:15:56,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:56,297 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:15:56,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:56,297 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:15:56,297 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:15:56,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:15:56,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:56,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 [2018-10-26 19:15:56,307 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:15:56,307 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:15:56,323 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:15:56,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:15:56,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:15:56,341 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:15:56,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:15:56,871 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-26 19:15:56,889 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:15:56,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-10-26 19:15:56,889 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:15:56,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-26 19:15:56,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-26 19:15:56,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-26 19:15:56,890 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-10-26 19:15:56,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:15:56,947 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-10-26 19:15:56,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-26 19:15:56,948 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-10-26 19:15:56,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:15:56,949 INFO L225 Difference]: With dead ends: 31 [2018-10-26 19:15:56,949 INFO L226 Difference]: Without dead ends: 27 [2018-10-26 19:15:56,950 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-26 19:15:56,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-26 19:15:56,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-26 19:15:56,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-26 19:15:56,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-26 19:15:56,955 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-10-26 19:15:56,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:15:56,956 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-26 19:15:56,956 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-26 19:15:56,956 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-26 19:15:56,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-26 19:15:56,957 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:15:56,957 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:15:56,957 INFO L424 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:15:56,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:15:56,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-10-26 19:15:56,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:15:56,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:56,958 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:15:56,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:56,959 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:15:56,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:57,057 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:15:57,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:57,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:15:57,058 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:15:57,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:15:57,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:57,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 [2018-10-26 19:15:57,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:15:57,080 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:15:57,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:57,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:15:57,109 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:15:57,110 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:15:57,710 WARN L179 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2018-10-26 19:15:58,071 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-26 19:15:58,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:15:58,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-10-26 19:15:58,090 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:15:58,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-26 19:15:58,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-26 19:15:58,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-10-26 19:15:58,091 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-10-26 19:15:58,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:15:58,181 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-10-26 19:15:58,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-26 19:15:58,186 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-10-26 19:15:58,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:15:58,187 INFO L225 Difference]: With dead ends: 34 [2018-10-26 19:15:58,187 INFO L226 Difference]: Without dead ends: 30 [2018-10-26 19:15:58,187 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-10-26 19:15:58,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-26 19:15:58,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-26 19:15:58,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-26 19:15:58,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-10-26 19:15:58,193 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-10-26 19:15:58,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:15:58,193 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-10-26 19:15:58,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-26 19:15:58,193 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-10-26 19:15:58,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-26 19:15:58,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:15:58,194 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:15:58,194 INFO L424 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:15:58,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:15:58,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-10-26 19:15:58,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:15:58,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:58,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:15:58,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:58,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:15:58,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:58,329 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:15:58,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:58,329 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:15:58,329 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:15:58,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:15:58,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:58,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 [2018-10-26 19:15:58,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:15:58,341 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:15:58,356 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-26 19:15:58,357 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:15:58,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:15:58,382 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:15:58,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:15:59,182 WARN L179 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2018-10-26 19:15:59,710 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:15:59,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:15:59,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-10-26 19:15:59,729 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:15:59,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-26 19:15:59,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-26 19:15:59,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-10-26 19:15:59,730 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-10-26 19:15:59,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:15:59,810 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-10-26 19:15:59,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-26 19:15:59,811 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-10-26 19:15:59,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:15:59,812 INFO L225 Difference]: With dead ends: 37 [2018-10-26 19:15:59,812 INFO L226 Difference]: Without dead ends: 33 [2018-10-26 19:15:59,813 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2018-10-26 19:15:59,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-26 19:15:59,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-26 19:15:59,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-26 19:15:59,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-10-26 19:15:59,817 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-10-26 19:15:59,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:15:59,818 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-10-26 19:15:59,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-26 19:15:59,818 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-10-26 19:15:59,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-26 19:15:59,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:15:59,819 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:15:59,819 INFO L424 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:15:59,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:15:59,819 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-10-26 19:15:59,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:15:59,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:59,820 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:15:59,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:15:59,821 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:15:59,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:15:59,924 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:15:59,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:59,925 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:15:59,925 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:15:59,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:15:59,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:15:59,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 [2018-10-26 19:15:59,936 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:15:59,936 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:15:59,965 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:15:59,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:15:59,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:15:59,984 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:15:59,984 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:01,109 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-26 19:16:01,127 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:01,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-10-26 19:16:01,127 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:01,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-26 19:16:01,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-26 19:16:01,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-10-26 19:16:01,128 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-10-26 19:16:01,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:01,246 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-10-26 19:16:01,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-26 19:16:01,254 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-10-26 19:16:01,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:01,255 INFO L225 Difference]: With dead ends: 40 [2018-10-26 19:16:01,255 INFO L226 Difference]: Without dead ends: 36 [2018-10-26 19:16:01,255 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 83 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2018-10-26 19:16:01,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-26 19:16:01,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-26 19:16:01,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-26 19:16:01,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-10-26 19:16:01,262 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-10-26 19:16:01,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:01,262 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-10-26 19:16:01,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-26 19:16:01,262 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-10-26 19:16:01,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-26 19:16:01,263 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:01,263 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:01,264 INFO L424 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:01,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:01,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-10-26 19:16:01,264 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:01,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:01,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:16:01,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:01,269 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:01,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:01,461 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:16:01,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:01,461 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:16:01,461 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:16:01,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:16:01,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:01,462 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/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 [2018-10-26 19:16:01,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:16:01,469 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:16:01,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:01,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:16:01,515 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:16:01,515 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:03,152 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-26 19:16:03,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:03,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-10-26 19:16:03,170 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:03,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-26 19:16:03,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-26 19:16:03,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-10-26 19:16:03,172 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-10-26 19:16:03,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:03,265 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-10-26 19:16:03,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-26 19:16:03,266 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-10-26 19:16:03,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:03,267 INFO L225 Difference]: With dead ends: 43 [2018-10-26 19:16:03,267 INFO L226 Difference]: Without dead ends: 39 [2018-10-26 19:16:03,267 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 93 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-10-26 19:16:03,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-26 19:16:03,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-26 19:16:03,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-26 19:16:03,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-26 19:16:03,271 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-10-26 19:16:03,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:03,272 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-26 19:16:03,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-26 19:16:03,272 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-26 19:16:03,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-26 19:16:03,273 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:03,273 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:03,275 INFO L424 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:03,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:03,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-10-26 19:16:03,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:03,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:03,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:16:03,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:03,276 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:03,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:03,424 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:16:03,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:03,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:16:03,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:16:03,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:16:03,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:03,425 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:16:03,431 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:16:03,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:16:03,489 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-26 19:16:03,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:16:03,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:16:03,513 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:16:03,513 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:04,457 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2018-10-26 19:16:05,551 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-26 19:16:05,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:05,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-10-26 19:16:05,568 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:05,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-26 19:16:05,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-26 19:16:05,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-10-26 19:16:05,569 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-10-26 19:16:05,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:05,694 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-10-26 19:16:05,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-26 19:16:05,695 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-10-26 19:16:05,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:05,696 INFO L225 Difference]: With dead ends: 46 [2018-10-26 19:16:05,696 INFO L226 Difference]: Without dead ends: 42 [2018-10-26 19:16:05,697 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 103 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2018-10-26 19:16:05,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-26 19:16:05,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-26 19:16:05,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-26 19:16:05,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-10-26 19:16:05,703 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-10-26 19:16:05,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:05,703 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-10-26 19:16:05,703 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-26 19:16:05,703 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-10-26 19:16:05,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-26 19:16:05,704 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:05,704 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:05,705 INFO L424 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:05,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:05,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-10-26 19:16:05,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:05,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:05,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:16:05,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:05,706 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:05,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:05,858 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:16:05,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:05,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:16:05,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:16:05,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:16:05,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:05,859 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:16:05,876 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:16:05,876 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:16:05,894 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:16:05,894 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:16:05,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:16:05,924 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:16:05,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:07,088 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2018-10-26 19:16:08,522 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-26 19:16:08,538 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:08,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-10-26 19:16:08,538 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:08,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-26 19:16:08,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-26 19:16:08,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-10-26 19:16:08,539 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-10-26 19:16:08,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:08,632 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-26 19:16:08,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-26 19:16:08,633 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-10-26 19:16:08,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:08,634 INFO L225 Difference]: With dead ends: 49 [2018-10-26 19:16:08,634 INFO L226 Difference]: Without dead ends: 45 [2018-10-26 19:16:08,635 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2018-10-26 19:16:08,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-26 19:16:08,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-26 19:16:08,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-26 19:16:08,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-10-26 19:16:08,638 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-10-26 19:16:08,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:08,638 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-10-26 19:16:08,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-26 19:16:08,638 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-10-26 19:16:08,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-26 19:16:08,639 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:08,639 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:08,640 INFO L424 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:08,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:08,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-10-26 19:16:08,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:08,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:08,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:16:08,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:08,641 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:08,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:08,765 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:16:08,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:08,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:16:08,766 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:16:08,766 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:16:08,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:08,766 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:16:08,772 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:16:08,772 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:16:08,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:08,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:16:08,812 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-26 19:16:08,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:09,266 WARN L179 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2018-10-26 19:16:11,965 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-10-26 19:16:11,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:11,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-10-26 19:16:11,982 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:11,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-26 19:16:11,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-26 19:16:11,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-10-26 19:16:11,983 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-10-26 19:16:12,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:12,099 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-10-26 19:16:12,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-26 19:16:12,100 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-10-26 19:16:12,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:12,101 INFO L225 Difference]: With dead ends: 52 [2018-10-26 19:16:12,101 INFO L226 Difference]: Without dead ends: 48 [2018-10-26 19:16:12,101 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2018-10-26 19:16:12,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-26 19:16:12,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-26 19:16:12,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-26 19:16:12,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-10-26 19:16:12,104 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-10-26 19:16:12,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:12,105 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-10-26 19:16:12,105 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-26 19:16:12,105 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-10-26 19:16:12,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-26 19:16:12,108 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:12,108 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:12,109 INFO L424 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:12,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:12,109 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-10-26 19:16:12,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:12,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:12,109 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:16:12,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:12,110 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:12,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:12,845 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:16:12,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:12,845 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:16:12,845 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:16:12,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:16:12,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:12,845 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:16:12,852 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:16:12,852 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:16:12,875 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-26 19:16:12,875 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:16:12,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:16:12,888 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-26 19:16:12,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:16,251 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2018-10-26 19:16:17,009 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-26 19:16:17,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:17,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-10-26 19:16:17,026 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:17,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-26 19:16:17,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-26 19:16:17,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-10-26 19:16:17,027 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-10-26 19:16:17,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:17,228 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-10-26 19:16:17,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-26 19:16:17,228 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-10-26 19:16:17,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:17,229 INFO L225 Difference]: With dead ends: 55 [2018-10-26 19:16:17,229 INFO L226 Difference]: Without dead ends: 51 [2018-10-26 19:16:17,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2018-10-26 19:16:17,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-26 19:16:17,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-10-26 19:16:17,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-26 19:16:17,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-10-26 19:16:17,236 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-10-26 19:16:17,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:17,237 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-10-26 19:16:17,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-26 19:16:17,237 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-10-26 19:16:17,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-26 19:16:17,240 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:17,240 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:17,240 INFO L424 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:17,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:17,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-10-26 19:16:17,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:17,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:17,241 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:16:17,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:17,241 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:17,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:17,443 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:16:17,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:17,443 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:16:17,444 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:16:17,444 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:16:17,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:17,444 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:16:17,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:16:17,450 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:16:17,469 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:16:17,469 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:16:17,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:16:17,510 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-26 19:16:17,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:20,297 WARN L179 SmtUtils]: Spent 390.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-10-26 19:16:20,443 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2018-10-26 19:16:22,270 WARN L179 SmtUtils]: Spent 466.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2018-10-26 19:16:23,818 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-10-26 19:16:23,834 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:23,834 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-10-26 19:16:23,834 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:23,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-26 19:16:23,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-26 19:16:23,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-10-26 19:16:23,835 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-10-26 19:16:23,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:23,982 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-10-26 19:16:23,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-26 19:16:23,983 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-10-26 19:16:23,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:23,984 INFO L225 Difference]: With dead ends: 58 [2018-10-26 19:16:23,984 INFO L226 Difference]: Without dead ends: 54 [2018-10-26 19:16:23,984 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-10-26 19:16:23,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-26 19:16:23,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-26 19:16:23,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-26 19:16:23,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-10-26 19:16:23,989 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-10-26 19:16:23,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:23,989 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-10-26 19:16:23,989 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-26 19:16:23,989 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-10-26 19:16:23,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-26 19:16:23,994 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:23,994 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:23,994 INFO L424 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:23,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:23,995 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-10-26 19:16:23,995 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:23,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:23,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:16:23,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:23,995 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:24,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:24,201 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:16:24,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:24,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:16:24,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:16:24,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:16:24,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:24,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:16:24,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:16:24,208 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:16:24,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:24,231 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:16:24,249 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-26 19:16:24,249 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:30,777 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-26 19:16:30,794 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:30,794 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-10-26 19:16:30,794 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:30,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-26 19:16:30,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-26 19:16:30,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-10-26 19:16:30,795 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-10-26 19:16:30,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:30,942 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-10-26 19:16:30,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-26 19:16:30,943 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-10-26 19:16:30,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:30,944 INFO L225 Difference]: With dead ends: 61 [2018-10-26 19:16:30,944 INFO L226 Difference]: Without dead ends: 57 [2018-10-26 19:16:30,945 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 153 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2018-10-26 19:16:30,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-26 19:16:30,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-26 19:16:30,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-26 19:16:30,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-10-26 19:16:30,951 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-10-26 19:16:30,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:30,951 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-10-26 19:16:30,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-26 19:16:30,951 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-10-26 19:16:30,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-26 19:16:30,952 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:30,952 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:30,952 INFO L424 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:30,952 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:30,952 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-10-26 19:16:30,953 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:30,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:30,953 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:16:30,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:30,953 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:30,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:16:31,619 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:16:31,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:31,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:16:31,619 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:16:31,620 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:16:31,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:16:31,620 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 19:16:31,628 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:16:31,628 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:16:31,657 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-26 19:16:31,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:16:31,659 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:16:31,675 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-10-26 19:16:31,675 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:16:39,231 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-10-26 19:16:39,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:16:39,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 34 [2018-10-26 19:16:39,248 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:16:39,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-26 19:16:39,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-26 19:16:39,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2018-10-26 19:16:39,249 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-10-26 19:16:39,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:16:39,465 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-10-26 19:16:39,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-26 19:16:39,466 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-10-26 19:16:39,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:16:39,466 INFO L225 Difference]: With dead ends: 64 [2018-10-26 19:16:39,466 INFO L226 Difference]: Without dead ends: 60 [2018-10-26 19:16:39,467 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 31 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=800, Invalid=1552, Unknown=0, NotChecked=0, Total=2352 [2018-10-26 19:16:39,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-26 19:16:39,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-26 19:16:39,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-26 19:16:39,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-10-26 19:16:39,472 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-10-26 19:16:39,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:16:39,473 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-10-26 19:16:39,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-26 19:16:39,473 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-10-26 19:16:39,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-26 19:16:39,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:16:39,476 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:16:39,476 INFO L424 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:16:39,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:16:39,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-10-26 19:16:39,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:16:39,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:39,477 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:16:39,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:16:39,477 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:16:39,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 19:16:39,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 19:16:39,518 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-26 19:16:39,549 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.10 07:16:39 BoogieIcfgContainer [2018-10-26 19:16:39,549 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-26 19:16:39,550 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-26 19:16:39,550 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-26 19:16:39,550 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-26 19:16:39,551 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:15:53" (3/4) ... [2018-10-26 19:16:39,554 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-26 19:16:39,598 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_55feaf95-990f-462e-be60-38f05fc77c9c/bin-2019/utaipan/witness.graphml [2018-10-26 19:16:39,598 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-26 19:16:39,600 INFO L168 Benchmark]: Toolchain (without parser) took 47098.22 ms. Allocated memory was 1.0 GB in the beginning and 1.7 GB in the end (delta: 625.5 MB). Free memory was 958.0 MB in the beginning and 916.2 MB in the end (delta: 41.9 MB). Peak memory consumption was 667.3 MB. Max. memory is 11.5 GB. [2018-10-26 19:16:39,600 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 19:16:39,600 INFO L168 Benchmark]: CACSL2BoogieTranslator took 212.60 ms. Allocated memory is still 1.0 GB. Free memory was 958.0 MB in the beginning and 947.2 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. [2018-10-26 19:16:39,601 INFO L168 Benchmark]: Boogie Procedure Inliner took 18.84 ms. Allocated memory is still 1.0 GB. Free memory is still 947.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 19:16:39,601 INFO L168 Benchmark]: Boogie Preprocessor took 16.34 ms. Allocated memory is still 1.0 GB. Free memory is still 947.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 19:16:39,601 INFO L168 Benchmark]: RCFGBuilder took 470.21 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 203.9 MB). Free memory was 947.2 MB in the beginning and 1.2 GB in the end (delta: -244.9 MB). Peak memory consumption was 22.5 MB. Max. memory is 11.5 GB. [2018-10-26 19:16:39,602 INFO L168 Benchmark]: TraceAbstraction took 46326.47 ms. Allocated memory was 1.2 GB in the beginning and 1.7 GB in the end (delta: 421.5 MB). Free memory was 1.2 GB in the beginning and 930.8 MB in the end (delta: 261.4 MB). Peak memory consumption was 682.9 MB. Max. memory is 11.5 GB. [2018-10-26 19:16:39,602 INFO L168 Benchmark]: Witness Printer took 48.21 ms. Allocated memory is still 1.7 GB. Free memory was 930.8 MB in the beginning and 916.2 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 11.5 GB. [2018-10-26 19:16:39,604 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 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 212.60 ms. Allocated memory is still 1.0 GB. Free memory was 958.0 MB in the beginning and 947.2 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 18.84 ms. Allocated memory is still 1.0 GB. Free memory is still 947.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 16.34 ms. Allocated memory is still 1.0 GB. Free memory is still 947.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 470.21 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 203.9 MB). Free memory was 947.2 MB in the beginning and 1.2 GB in the end (delta: -244.9 MB). Peak memory consumption was 22.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 46326.47 ms. Allocated memory was 1.2 GB in the beginning and 1.7 GB in the end (delta: 421.5 MB). Free memory was 1.2 GB in the beginning and 930.8 MB in the end (delta: 261.4 MB). Peak memory consumption was 682.9 MB. Max. memory is 11.5 GB. * Witness Printer took 48.21 ms. Allocated memory is still 1.7 GB. Free memory was 930.8 MB in the beginning and 916.2 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 15; [L13] int b = 0; VAL [a=15, b=0] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=15] [L4] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=15, m=0, n=15] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=14] [L4] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=14, m=1, n=14] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=13] [L4] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=13, m=2, n=13] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=12] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=12, m=3, n=12] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=11] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=11, m=4, n=11] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=10] [L4] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=10, m=5, n=10] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=9] [L4] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=9, m=6, n=9] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=8] [L4] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=8, m=7, n=8] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=7] [L4] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=7, m=8, n=7] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=6] [L4] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=6, m=9, n=6] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=5] [L4] COND FALSE !(n <= 0) VAL [\old(m)=10, \old(n)=5, m=10, n=5] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=4] [L4] COND FALSE !(n <= 0) VAL [\old(m)=11, \old(n)=4, m=11, n=4] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=3] [L4] COND FALSE !(n <= 0) VAL [\old(m)=12, \old(n)=3, m=12, n=3] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=13, \old(n)=2, m=13, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=14, \old(n)=1, m=14, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=0] [L4] COND TRUE n <= 0 [L5] RET return m + n; VAL [\old(m)=15, \old(n)=0, \result=15, m=15, n=0] [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=1, m=14, n=1, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=2, m=13, n=2, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=3, m=12, n=3, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=4, m=11, n=4, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=5, m=10, n=5, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=6, m=9, n=6, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=7, m=8, n=7, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=8, m=7, n=8, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=9, m=6, n=9, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=10, m=5, n=10, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=11, m=4, n=11, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=12, m=3, n=12, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=13, m=2, n=13, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=14, m=1, n=14, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=15, m=0, n=15, sum(n - 1, m + 1)=15] [L7] RET return sum(n - 1, m + 1); [L14] EXPR sum(a, b) VAL [a=15, b=0, sum(a, b)=15] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=15, b=0, result=15] [L16] __VERIFIER_error() VAL [a=15, b=0, result=15] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 46.2s OverallTime, 16 OverallIterations, 16 TraceHistogramMax, 1.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 183 SDtfs, 318 SDslu, 1173 SDs, 0 SdLazy, 918 SolverSat, 19 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2015 GetRequests, 1374 SyntacticMatches, 239 SemanticMatches, 402 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3554 ImplicationChecksByTransitivity, 7.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 42.4s InterpolantComputationTime, 1740 NumberOfCodeBlocks, 1740 NumberOfCodeBlocksAsserted, 74 NumberOfCheckSat, 2406 ConstructedInterpolants, 0 QuantifiedInterpolants, 462912 SizeOfPredicates, 133 NumberOfNonLiveVariables, 2408 ConjunctsInSsa, 266 ConjunctsInUnsatCore, 43 InterpolantComputations, 1 PerfectInterpolantSequences, 3710/9450 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...