./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/sum_25x0_false-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_25x0_false-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/config/svcomp-Reach-32bit-PetriAutomizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 59acfc6d5178664a3f2144603274c2b6e876292a ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.23-5842f4b [2018-11-18 16:25:19,492 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 16:25:19,493 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 16:25:19,501 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 16:25:19,501 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 16:25:19,502 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 16:25:19,503 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 16:25:19,504 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 16:25:19,505 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 16:25:19,505 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 16:25:19,506 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 16:25:19,506 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 16:25:19,507 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 16:25:19,507 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 16:25:19,508 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 16:25:19,508 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 16:25:19,509 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 16:25:19,510 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 16:25:19,511 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 16:25:19,512 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 16:25:19,513 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 16:25:19,514 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 16:25:19,515 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 16:25:19,515 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 16:25:19,515 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 16:25:19,516 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 16:25:19,517 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 16:25:19,517 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 16:25:19,518 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 16:25:19,518 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 16:25:19,518 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 16:25:19,519 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 16:25:19,519 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 16:25:19,519 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 16:25:19,520 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 16:25:19,520 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 16:25:19,520 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/config/svcomp-Reach-32bit-PetriAutomizer_Default.epf [2018-11-18 16:25:19,530 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 16:25:19,530 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 16:25:19,530 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 16:25:19,531 INFO L133 SettingsManager]: * Process only entry and re-entry procedures=false [2018-11-18 16:25:19,531 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-18 16:25:19,531 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-18 16:25:19,531 INFO L133 SettingsManager]: * Use SBE=true [2018-11-18 16:25:19,532 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 16:25:19,532 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 16:25:19,532 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 16:25:19,532 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 16:25:19,532 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 16:25:19,532 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 16:25:19,532 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 16:25:19,533 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 16:25:19,533 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 16:25:19,533 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 16:25:19,533 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 16:25:19,533 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 16:25:19,533 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 16:25:19,533 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 16:25:19,534 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 16:25:19,534 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 16:25:19,534 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 16:25:19,534 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 16:25:19,534 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 16:25:19,534 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 16:25:19,534 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-18 16:25:19,535 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 16:25:19,535 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 16:25:19,535 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true 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_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer 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 -> Automizer 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 -> 59acfc6d5178664a3f2144603274c2b6e876292a [2018-11-18 16:25:19,558 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 16:25:19,568 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 16:25:19,571 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 16:25:19,572 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 16:25:19,572 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 16:25:19,572 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/../../sv-benchmarks/c/recursive-simple/sum_25x0_false-unreach-call_true-termination.c [2018-11-18 16:25:19,617 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/data/ba6a02a1a/20ebd4ca44074cf99aadc76908b5ee97/FLAG326cab67f [2018-11-18 16:25:19,905 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 16:25:19,905 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/sv-benchmarks/c/recursive-simple/sum_25x0_false-unreach-call_true-termination.c [2018-11-18 16:25:19,909 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/data/ba6a02a1a/20ebd4ca44074cf99aadc76908b5ee97/FLAG326cab67f [2018-11-18 16:25:19,918 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/data/ba6a02a1a/20ebd4ca44074cf99aadc76908b5ee97 [2018-11-18 16:25:19,920 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 16:25:19,920 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-18 16:25:19,921 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 16:25:19,921 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 16:25:19,924 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 16:25:19,925 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 04:25:19" (1/1) ... [2018-11-18 16:25:19,927 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22909f40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:19, skipping insertion in model container [2018-11-18 16:25:19,927 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 04:25:19" (1/1) ... [2018-11-18 16:25:19,932 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 16:25:19,942 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 16:25:20,036 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 16:25:20,038 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 16:25:20,046 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 16:25:20,054 INFO L195 MainTranslator]: Completed translation [2018-11-18 16:25:20,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20 WrapperNode [2018-11-18 16:25:20,054 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 16:25:20,054 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 16:25:20,055 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 16:25:20,055 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 16:25:20,064 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (1/1) ... [2018-11-18 16:25:20,064 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (1/1) ... [2018-11-18 16:25:20,067 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (1/1) ... [2018-11-18 16:25:20,067 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (1/1) ... [2018-11-18 16:25:20,070 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (1/1) ... [2018-11-18 16:25:20,071 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (1/1) ... [2018-11-18 16:25:20,071 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (1/1) ... [2018-11-18 16:25:20,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 16:25:20,072 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 16:25:20,072 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 16:25:20,072 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 16:25:20,073 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 16:25:20,146 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 16:25:20,147 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 16:25:20,147 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-11-18 16:25:20,147 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 16:25:20,147 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-11-18 16:25:20,147 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-11-18 16:25:20,147 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 16:25:20,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 16:25:20,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 16:25:20,254 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 16:25:20,255 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 04:25:20 BoogieIcfgContainer [2018-11-18 16:25:20,255 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 16:25:20,255 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 16:25:20,256 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 16:25:20,258 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 16:25:20,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 04:25:19" (1/3) ... [2018-11-18 16:25:20,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35fec0d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 04:25:20, skipping insertion in model container [2018-11-18 16:25:20,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:25:20" (2/3) ... [2018-11-18 16:25:20,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35fec0d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 04:25:20, skipping insertion in model container [2018-11-18 16:25:20,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 04:25:20" (3/3) ... [2018-11-18 16:25:20,260 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_25x0_false-unreach-call_true-termination.c [2018-11-18 16:25:20,266 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 16:25:20,270 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 16:25:20,279 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 16:25:20,297 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-18 16:25:20,298 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 16:25:20,298 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 16:25:20,298 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 16:25:20,298 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 16:25:20,298 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 16:25:20,298 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 16:25:20,298 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 16:25:20,298 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 16:25:20,310 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-18 16:25:20,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-18 16:25:20,314 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:20,315 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:20,316 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:20,320 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:20,320 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2018-11-18 16:25:20,321 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:20,321 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:20,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:20,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:20,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:20,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:20,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 16:25:20,434 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 16:25:20,434 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 16:25:20,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 16:25:20,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 16:25:20,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 16:25:20,447 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-18 16:25:20,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:20,524 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-18 16:25:20,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 16:25:20,525 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-18 16:25:20,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:20,531 INFO L225 Difference]: With dead ends: 30 [2018-11-18 16:25:20,531 INFO L226 Difference]: Without dead ends: 18 [2018-11-18 16:25:20,533 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-18 16:25:20,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-18 16:25:20,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-18 16:25:20,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-18 16:25:20,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-18 16:25:20,557 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-18 16:25:20,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:20,557 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-18 16:25:20,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 16:25:20,558 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-18 16:25:20,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-18 16:25:20,559 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:20,559 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:20,560 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:20,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:20,560 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2018-11-18 16:25:20,560 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:20,560 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:20,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:20,561 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:20,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:20,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:20,621 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 16:25:20,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:20,621 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:20,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:20,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:20,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:20,677 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 16:25:20,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:20,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-11-18 16:25:20,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 16:25:20,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 16:25:20,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-18 16:25:20,693 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-18 16:25:20,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:20,773 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-18 16:25:20,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 16:25:20,773 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-18 16:25:20,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:20,774 INFO L225 Difference]: With dead ends: 25 [2018-11-18 16:25:20,774 INFO L226 Difference]: Without dead ends: 21 [2018-11-18 16:25:20,775 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-11-18 16:25:20,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-18 16:25:20,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-18 16:25:20,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-18 16:25:20,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-18 16:25:20,779 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-18 16:25:20,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:20,780 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-18 16:25:20,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 16:25:20,780 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-18 16:25:20,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-18 16:25:20,780 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:20,781 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:20,781 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:20,781 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:20,781 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2018-11-18 16:25:20,781 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:20,781 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:20,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:20,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:20,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:20,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:20,859 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-18 16:25:20,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:20,859 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:20,874 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 16:25:20,885 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 16:25:20,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:20,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:20,895 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-18 16:25:20,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:20,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-11-18 16:25:20,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 16:25:20,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 16:25:20,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-18 16:25:20,912 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-11-18 16:25:20,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:20,953 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-18 16:25:20,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 16:25:20,953 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-11-18 16:25:20,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:20,954 INFO L225 Difference]: With dead ends: 28 [2018-11-18 16:25:20,954 INFO L226 Difference]: Without dead ends: 24 [2018-11-18 16:25:20,955 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-11-18 16:25:20,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-18 16:25:20,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-18 16:25:20,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-18 16:25:20,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-18 16:25:20,958 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-18 16:25:20,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:20,958 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-18 16:25:20,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 16:25:20,958 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-18 16:25:20,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-18 16:25:20,959 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:20,959 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:20,959 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:20,959 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:20,960 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2018-11-18 16:25:20,960 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:20,960 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:20,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:20,961 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:20,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:20,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:21,022 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 16:25:21,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:21,023 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:21,033 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:25:21,044 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-18 16:25:21,044 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:21,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:21,058 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 16:25:21,073 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:21,073 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-11-18 16:25:21,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 16:25:21,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 16:25:21,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-11-18 16:25:21,074 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-11-18 16:25:21,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:21,146 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-18 16:25:21,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-18 16:25:21,146 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-11-18 16:25:21,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:21,147 INFO L225 Difference]: With dead ends: 31 [2018-11-18 16:25:21,147 INFO L226 Difference]: Without dead ends: 27 [2018-11-18 16:25:21,147 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2018-11-18 16:25:21,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-18 16:25:21,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-18 16:25:21,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-18 16:25:21,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-18 16:25:21,150 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-18 16:25:21,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:21,151 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-18 16:25:21,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 16:25:21,151 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-18 16:25:21,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-18 16:25:21,151 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:21,152 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:21,152 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:21,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:21,152 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2018-11-18 16:25:21,152 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:21,152 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:21,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:21,153 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:21,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:21,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:21,211 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-18 16:25:21,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:21,212 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:21,223 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:25:21,236 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:25:21,237 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:21,240 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:21,253 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-18 16:25:21,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:21,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-11-18 16:25:21,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 16:25:21,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 16:25:21,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2018-11-18 16:25:21,274 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-18 16:25:21,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:21,331 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-18 16:25:21,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 16:25:21,331 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-11-18 16:25:21,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:21,332 INFO L225 Difference]: With dead ends: 34 [2018-11-18 16:25:21,332 INFO L226 Difference]: Without dead ends: 30 [2018-11-18 16:25:21,333 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2018-11-18 16:25:21,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-18 16:25:21,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-18 16:25:21,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-18 16:25:21,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-18 16:25:21,336 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-18 16:25:21,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:21,336 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-18 16:25:21,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 16:25:21,336 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-18 16:25:21,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-18 16:25:21,337 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:21,337 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:21,337 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:21,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:21,338 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2018-11-18 16:25:21,338 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:21,338 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:21,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:21,339 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:21,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:21,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:21,423 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-18 16:25:21,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:21,423 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:21,429 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-18 16:25:21,480 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-11-18 16:25:21,480 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:21,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:21,503 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-18 16:25:21,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:21,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-11-18 16:25:21,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-18 16:25:21,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-18 16:25:21,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-11-18 16:25:21,524 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-11-18 16:25:21,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:21,603 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-18 16:25:21,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-18 16:25:21,604 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-11-18 16:25:21,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:21,605 INFO L225 Difference]: With dead ends: 37 [2018-11-18 16:25:21,605 INFO L226 Difference]: Without dead ends: 33 [2018-11-18 16:25:21,605 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2018-11-18 16:25:21,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-18 16:25:21,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-18 16:25:21,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-18 16:25:21,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-18 16:25:21,610 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-18 16:25:21,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:21,611 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-18 16:25:21,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-18 16:25:21,611 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-18 16:25:21,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-18 16:25:21,612 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:21,612 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:21,612 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:21,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:21,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2018-11-18 16:25:21,612 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:21,613 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:21,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:21,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:21,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:21,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:21,695 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-18 16:25:21,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:21,696 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:21,702 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-18 16:25:21,721 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-11-18 16:25:21,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:21,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:21,735 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-18 16:25:21,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:21,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-11-18 16:25:21,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 16:25:21,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 16:25:21,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2018-11-18 16:25:21,750 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-11-18 16:25:21,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:21,815 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-18 16:25:21,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-18 16:25:21,816 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-11-18 16:25:21,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:21,817 INFO L225 Difference]: With dead ends: 40 [2018-11-18 16:25:21,817 INFO L226 Difference]: Without dead ends: 36 [2018-11-18 16:25:21,817 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2018-11-18 16:25:21,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-18 16:25:21,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-18 16:25:21,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-18 16:25:21,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-18 16:25:21,822 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-18 16:25:21,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:21,822 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-18 16:25:21,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 16:25:21,823 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-18 16:25:21,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-18 16:25:21,824 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:21,824 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:21,824 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:21,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:21,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2018-11-18 16:25:21,824 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:21,825 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:21,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:21,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:21,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:21,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:21,926 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-18 16:25:21,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:21,927 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:21,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:21,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:21,945 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:21,957 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-18 16:25:21,972 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:21,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-11-18 16:25:21,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 16:25:21,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 16:25:21,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2018-11-18 16:25:21,973 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-11-18 16:25:22,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:22,050 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-18 16:25:22,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 16:25:22,050 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-11-18 16:25:22,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:22,051 INFO L225 Difference]: With dead ends: 43 [2018-11-18 16:25:22,051 INFO L226 Difference]: Without dead ends: 39 [2018-11-18 16:25:22,052 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2018-11-18 16:25:22,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-18 16:25:22,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-18 16:25:22,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-18 16:25:22,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-18 16:25:22,056 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-18 16:25:22,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:22,057 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-18 16:25:22,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 16:25:22,057 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-18 16:25:22,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-18 16:25:22,058 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:22,058 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:22,058 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:22,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:22,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2018-11-18 16:25:22,059 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:22,059 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:22,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:22,060 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:22,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:22,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:22,149 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-18 16:25:22,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:22,150 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/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 [2018-11-18 16:25:22,157 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 16:25:22,177 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 16:25:22,177 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:22,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:22,197 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-18 16:25:22,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:22,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-11-18 16:25:22,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-18 16:25:22,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-18 16:25:22,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-11-18 16:25:22,223 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-11-18 16:25:22,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:22,314 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-18 16:25:22,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-18 16:25:22,314 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-18 16:25:22,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:22,315 INFO L225 Difference]: With dead ends: 46 [2018-11-18 16:25:22,315 INFO L226 Difference]: Without dead ends: 42 [2018-11-18 16:25:22,315 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2018-11-18 16:25:22,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-18 16:25:22,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-18 16:25:22,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-18 16:25:22,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-18 16:25:22,320 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-18 16:25:22,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:22,320 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-18 16:25:22,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-18 16:25:22,320 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-18 16:25:22,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-18 16:25:22,321 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:22,321 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:22,321 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:22,322 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:22,322 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2018-11-18 16:25:22,322 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:22,322 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:22,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:22,323 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:22,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:22,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:22,413 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-18 16:25:22,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:22,413 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/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 [2018-11-18 16:25:22,419 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:25:22,437 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-18 16:25:22,437 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:22,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:22,455 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-18 16:25:22,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:22,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-11-18 16:25:22,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-18 16:25:22,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-18 16:25:22,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2018-11-18 16:25:22,481 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-11-18 16:25:22,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:22,568 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-18 16:25:22,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-18 16:25:22,568 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-11-18 16:25:22,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:22,569 INFO L225 Difference]: With dead ends: 49 [2018-11-18 16:25:22,569 INFO L226 Difference]: Without dead ends: 45 [2018-11-18 16:25:22,570 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-11-18 16:25:22,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-18 16:25:22,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-18 16:25:22,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-18 16:25:22,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-18 16:25:22,573 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-18 16:25:22,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:22,573 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-18 16:25:22,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-18 16:25:22,573 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-18 16:25:22,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-18 16:25:22,574 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:22,574 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:22,574 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:22,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:22,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2018-11-18 16:25:22,574 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:22,574 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:22,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:22,575 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:22,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:22,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:22,692 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-18 16:25:22,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:22,692 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/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 [2018-11-18 16:25:22,700 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:25:22,718 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:25:22,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:22,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:22,739 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-18 16:25:22,754 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:22,755 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-11-18 16:25:22,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-18 16:25:22,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-18 16:25:22,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2018-11-18 16:25:22,755 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-11-18 16:25:22,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:22,889 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-11-18 16:25:22,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-18 16:25:22,890 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-11-18 16:25:22,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:22,891 INFO L225 Difference]: With dead ends: 52 [2018-11-18 16:25:22,891 INFO L226 Difference]: Without dead ends: 48 [2018-11-18 16:25:22,892 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=236, Invalid=414, Unknown=0, NotChecked=0, Total=650 [2018-11-18 16:25:22,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-18 16:25:22,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-18 16:25:22,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-18 16:25:22,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-18 16:25:22,896 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-11-18 16:25:22,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:22,896 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-18 16:25:22,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-18 16:25:22,896 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-18 16:25:22,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-18 16:25:22,900 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:22,900 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:22,900 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:22,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:22,900 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2018-11-18 16:25:22,900 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:22,900 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:22,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:22,901 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:22,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:22,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:23,034 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-18 16:25:23,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:23,034 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/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 [2018-11-18 16:25:23,040 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-18 16:25:23,079 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-11-18 16:25:23,079 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:23,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:23,100 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-18 16:25:23,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:23,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-11-18 16:25:23,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 16:25:23,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 16:25:23,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2018-11-18 16:25:23,116 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-11-18 16:25:23,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:23,267 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-11-18 16:25:23,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-18 16:25:23,268 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-11-18 16:25:23,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:23,269 INFO L225 Difference]: With dead ends: 55 [2018-11-18 16:25:23,269 INFO L226 Difference]: Without dead ends: 51 [2018-11-18 16:25:23,269 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2018-11-18 16:25:23,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-18 16:25:23,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-11-18 16:25:23,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-18 16:25:23,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-18 16:25:23,275 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-11-18 16:25:23,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:23,276 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-18 16:25:23,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 16:25:23,276 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-18 16:25:23,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-18 16:25:23,277 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:23,279 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:23,279 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:23,279 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:23,279 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2018-11-18 16:25:23,279 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:23,279 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:23,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:23,280 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:23,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:23,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:23,384 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-18 16:25:23,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:23,385 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/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 [2018-11-18 16:25:23,399 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-18 16:25:23,423 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-11-18 16:25:23,423 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:23,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:23,450 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-18 16:25:23,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:23,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-11-18 16:25:23,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-18 16:25:23,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-18 16:25:23,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2018-11-18 16:25:23,475 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-11-18 16:25:23,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:23,616 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-11-18 16:25:23,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-18 16:25:23,616 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-11-18 16:25:23,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:23,617 INFO L225 Difference]: With dead ends: 58 [2018-11-18 16:25:23,617 INFO L226 Difference]: Without dead ends: 54 [2018-11-18 16:25:23,618 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2018-11-18 16:25:23,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-18 16:25:23,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-11-18 16:25:23,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-18 16:25:23,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-18 16:25:23,622 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-11-18 16:25:23,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:23,622 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-18 16:25:23,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-18 16:25:23,623 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-18 16:25:23,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-18 16:25:23,623 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:23,624 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:23,624 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:23,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:23,624 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2018-11-18 16:25:23,624 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:23,624 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:23,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:23,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:23,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:23,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:23,745 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-18 16:25:23,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:23,745 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/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 [2018-11-18 16:25:23,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:23,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:23,772 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:23,792 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-18 16:25:23,807 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:23,807 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-11-18 16:25:23,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-18 16:25:23,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-18 16:25:23,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2018-11-18 16:25:23,808 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-11-18 16:25:23,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:23,963 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-11-18 16:25:23,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-18 16:25:23,964 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-11-18 16:25:23,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:23,964 INFO L225 Difference]: With dead ends: 61 [2018-11-18 16:25:23,964 INFO L226 Difference]: Without dead ends: 57 [2018-11-18 16:25:23,965 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=362, Invalid=630, Unknown=0, NotChecked=0, Total=992 [2018-11-18 16:25:23,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-18 16:25:23,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-18 16:25:23,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-18 16:25:23,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-18 16:25:23,969 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-11-18 16:25:23,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:23,969 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-18 16:25:23,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-18 16:25:23,970 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-18 16:25:23,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-18 16:25:23,970 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:23,970 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:23,971 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:23,971 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:23,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2018-11-18 16:25:23,971 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:23,971 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:23,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:23,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:23,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:23,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:24,093 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-18 16:25:24,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:24,093 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/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 [2018-11-18 16:25:24,099 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 16:25:24,117 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 16:25:24,118 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:24,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:24,140 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-18 16:25:24,161 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:24,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-11-18 16:25:24,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-18 16:25:24,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-18 16:25:24,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2018-11-18 16:25:24,162 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-11-18 16:25:24,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:24,302 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-11-18 16:25:24,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-18 16:25:24,302 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-11-18 16:25:24,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:24,302 INFO L225 Difference]: With dead ends: 64 [2018-11-18 16:25:24,302 INFO L226 Difference]: Without dead ends: 60 [2018-11-18 16:25:24,303 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=410, Invalid=712, Unknown=0, NotChecked=0, Total=1122 [2018-11-18 16:25:24,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-18 16:25:24,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-18 16:25:24,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-18 16:25:24,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-18 16:25:24,307 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-11-18 16:25:24,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:24,307 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-18 16:25:24,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-18 16:25:24,307 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-18 16:25:24,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-18 16:25:24,308 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:24,308 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:24,309 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:24,309 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:24,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2018-11-18 16:25:24,309 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:24,309 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:24,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:24,310 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:24,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:24,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:24,441 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-18 16:25:24,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:24,441 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:24,450 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:25:24,478 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-11-18 16:25:24,478 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:24,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:24,497 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-18 16:25:24,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:24,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-11-18 16:25:24,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-18 16:25:24,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-18 16:25:24,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2018-11-18 16:25:24,513 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-11-18 16:25:24,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:24,677 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-11-18 16:25:24,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-18 16:25:24,677 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-11-18 16:25:24,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:24,678 INFO L225 Difference]: With dead ends: 67 [2018-11-18 16:25:24,678 INFO L226 Difference]: Without dead ends: 63 [2018-11-18 16:25:24,679 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=461, Invalid=799, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 16:25:24,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-18 16:25:24,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-11-18 16:25:24,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-18 16:25:24,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-11-18 16:25:24,682 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-11-18 16:25:24,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:24,683 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-11-18 16:25:24,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-18 16:25:24,683 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-11-18 16:25:24,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-18 16:25:24,684 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:24,684 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:24,684 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:24,684 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:24,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1066046876, now seen corresponding path program 16 times [2018-11-18 16:25:24,684 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:24,684 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:24,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:24,685 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:24,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:24,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:24,840 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-18 16:25:24,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:24,840 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:24,846 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:25:24,867 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:25:24,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:24,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:24,884 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-18 16:25:24,899 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:24,899 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-11-18 16:25:24,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-18 16:25:24,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-18 16:25:24,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2018-11-18 16:25:24,900 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-11-18 16:25:25,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:25,079 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-11-18 16:25:25,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-18 16:25:25,079 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-11-18 16:25:25,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:25,080 INFO L225 Difference]: With dead ends: 70 [2018-11-18 16:25:25,080 INFO L226 Difference]: Without dead ends: 66 [2018-11-18 16:25:25,081 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2018-11-18 16:25:25,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-18 16:25:25,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-11-18 16:25:25,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-18 16:25:25,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-11-18 16:25:25,085 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-11-18 16:25:25,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:25,085 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-11-18 16:25:25,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-18 16:25:25,085 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-11-18 16:25:25,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-11-18 16:25:25,085 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:25,085 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:25,085 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:25,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:25,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1300351236, now seen corresponding path program 17 times [2018-11-18 16:25:25,086 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:25,086 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:25,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:25,086 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:25,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:25,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:25,256 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-18 16:25:25,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:25,257 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:25,263 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-18 16:25:25,326 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-11-18 16:25:25,327 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:25,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:25,357 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-18 16:25:25,381 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:25,381 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-11-18 16:25:25,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-18 16:25:25,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-18 16:25:25,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2018-11-18 16:25:25,382 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-11-18 16:25:25,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:25,562 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-11-18 16:25:25,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-18 16:25:25,562 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-11-18 16:25:25,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:25,563 INFO L225 Difference]: With dead ends: 73 [2018-11-18 16:25:25,563 INFO L226 Difference]: Without dead ends: 69 [2018-11-18 16:25:25,564 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=572, Invalid=988, Unknown=0, NotChecked=0, Total=1560 [2018-11-18 16:25:25,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-18 16:25:25,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-18 16:25:25,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-18 16:25:25,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-11-18 16:25:25,566 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-11-18 16:25:25,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:25,567 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-11-18 16:25:25,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-18 16:25:25,567 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-11-18 16:25:25,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-11-18 16:25:25,567 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:25,567 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:25,568 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:25,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:25,568 INFO L82 PathProgramCache]: Analyzing trace with hash 227065820, now seen corresponding path program 18 times [2018-11-18 16:25:25,568 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:25,568 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:25,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:25,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:25,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:25,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:25,764 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-18 16:25:25,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:25,764 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:25,773 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-18 16:25:25,804 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-11-18 16:25:25,804 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:25,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:25,822 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-18 16:25:25,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:25,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-11-18 16:25:25,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-18 16:25:25,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-18 16:25:25,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=292, Unknown=0, NotChecked=0, Total=506 [2018-11-18 16:25:25,837 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-11-18 16:25:26,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:26,036 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-11-18 16:25:26,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-18 16:25:26,036 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-11-18 16:25:26,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:26,037 INFO L225 Difference]: With dead ends: 76 [2018-11-18 16:25:26,037 INFO L226 Difference]: Without dead ends: 72 [2018-11-18 16:25:26,038 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=632, Invalid=1090, Unknown=0, NotChecked=0, Total=1722 [2018-11-18 16:25:26,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-18 16:25:26,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-11-18 16:25:26,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-18 16:25:26,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-11-18 16:25:26,040 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-11-18 16:25:26,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:26,041 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-11-18 16:25:26,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-18 16:25:26,041 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-11-18 16:25:26,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-11-18 16:25:26,042 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:26,042 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:26,042 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:26,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:26,042 INFO L82 PathProgramCache]: Analyzing trace with hash -479687356, now seen corresponding path program 19 times [2018-11-18 16:25:26,042 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:26,042 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:26,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:26,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:26,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:26,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:26,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-18 16:25:26,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:26,233 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:26,240 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:26,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:26,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:26,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-18 16:25:26,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:26,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-11-18 16:25:26,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-18 16:25:26,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-18 16:25:26,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2018-11-18 16:25:26,298 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-11-18 16:25:26,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:26,540 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-11-18 16:25:26,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-18 16:25:26,541 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-11-18 16:25:26,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:26,541 INFO L225 Difference]: With dead ends: 79 [2018-11-18 16:25:26,541 INFO L226 Difference]: Without dead ends: 75 [2018-11-18 16:25:26,542 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=695, Invalid=1197, Unknown=0, NotChecked=0, Total=1892 [2018-11-18 16:25:26,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-18 16:25:26,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-11-18 16:25:26,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-18 16:25:26,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-11-18 16:25:26,546 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-11-18 16:25:26,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:26,547 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-11-18 16:25:26,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-18 16:25:26,547 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-11-18 16:25:26,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-11-18 16:25:26,547 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:26,547 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:26,548 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:26,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:26,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1598174692, now seen corresponding path program 20 times [2018-11-18 16:25:26,548 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:26,548 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:26,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:26,548 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:25:26,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:26,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:26,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-11-18 16:25:26,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:26,746 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:26,752 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 16:25:26,777 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 16:25:26,778 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:26,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:26,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-11-18 16:25:26,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:26,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-11-18 16:25:26,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-18 16:25:26,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-18 16:25:26,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=343, Unknown=0, NotChecked=0, Total=600 [2018-11-18 16:25:26,823 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 25 states. [2018-11-18 16:25:27,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:27,050 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2018-11-18 16:25:27,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-18 16:25:27,050 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 133 [2018-11-18 16:25:27,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:27,051 INFO L225 Difference]: With dead ends: 82 [2018-11-18 16:25:27,051 INFO L226 Difference]: Without dead ends: 78 [2018-11-18 16:25:27,052 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=761, Invalid=1309, Unknown=0, NotChecked=0, Total=2070 [2018-11-18 16:25:27,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-18 16:25:27,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-11-18 16:25:27,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-11-18 16:25:27,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-11-18 16:25:27,055 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 133 [2018-11-18 16:25:27,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:27,055 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-11-18 16:25:27,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-18 16:25:27,055 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-11-18 16:25:27,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-11-18 16:25:27,056 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:27,056 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:27,056 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:27,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:27,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1648275844, now seen corresponding path program 21 times [2018-11-18 16:25:27,057 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:27,057 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:27,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:27,057 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:27,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:27,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:27,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-11-18 16:25:27,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:27,263 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:27,271 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:25:27,314 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-11-18 16:25:27,315 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:27,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:27,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-11-18 16:25:27,356 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:27,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-11-18 16:25:27,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-18 16:25:27,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-18 16:25:27,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2018-11-18 16:25:27,357 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 26 states. [2018-11-18 16:25:27,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:27,611 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-11-18 16:25:27,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-18 16:25:27,612 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 139 [2018-11-18 16:25:27,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:27,613 INFO L225 Difference]: With dead ends: 85 [2018-11-18 16:25:27,613 INFO L226 Difference]: Without dead ends: 81 [2018-11-18 16:25:27,613 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=830, Invalid=1426, Unknown=0, NotChecked=0, Total=2256 [2018-11-18 16:25:27,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-18 16:25:27,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-11-18 16:25:27,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-11-18 16:25:27,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-11-18 16:25:27,617 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 139 [2018-11-18 16:25:27,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:27,617 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-11-18 16:25:27,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-18 16:25:27,617 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-11-18 16:25:27,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-11-18 16:25:27,618 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:27,618 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:27,618 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:27,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:27,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1314278308, now seen corresponding path program 22 times [2018-11-18 16:25:27,618 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:27,618 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:27,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:27,619 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:27,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:27,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:27,849 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-11-18 16:25:27,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:27,850 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:27,855 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:25:27,879 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:25:27,879 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:27,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:27,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-11-18 16:25:27,930 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:27,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-11-18 16:25:27,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-18 16:25:27,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-18 16:25:27,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=398, Unknown=0, NotChecked=0, Total=702 [2018-11-18 16:25:27,931 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 27 states. [2018-11-18 16:25:28,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:28,172 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2018-11-18 16:25:28,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-18 16:25:28,172 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2018-11-18 16:25:28,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:28,173 INFO L225 Difference]: With dead ends: 88 [2018-11-18 16:25:28,173 INFO L226 Difference]: Without dead ends: 84 [2018-11-18 16:25:28,174 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=902, Invalid=1548, Unknown=0, NotChecked=0, Total=2450 [2018-11-18 16:25:28,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-11-18 16:25:28,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-11-18 16:25:28,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-11-18 16:25:28,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-11-18 16:25:28,176 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 145 [2018-11-18 16:25:28,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:28,177 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-11-18 16:25:28,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-18 16:25:28,177 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-11-18 16:25:28,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-11-18 16:25:28,177 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:28,177 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:28,177 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:28,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:28,178 INFO L82 PathProgramCache]: Analyzing trace with hash 2015638980, now seen corresponding path program 23 times [2018-11-18 16:25:28,178 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:28,178 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:28,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:28,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:28,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:28,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:28,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-11-18 16:25:28,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:28,404 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:28,415 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-18 16:25:28,458 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-11-18 16:25:28,459 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:28,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:28,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-11-18 16:25:28,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:28,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-11-18 16:25:28,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-18 16:25:28,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-18 16:25:28,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2018-11-18 16:25:28,519 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 28 states. [2018-11-18 16:25:28,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:28,783 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-11-18 16:25:28,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-18 16:25:28,783 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 151 [2018-11-18 16:25:28,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:28,784 INFO L225 Difference]: With dead ends: 91 [2018-11-18 16:25:28,784 INFO L226 Difference]: Without dead ends: 87 [2018-11-18 16:25:28,785 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=977, Invalid=1675, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 16:25:28,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-18 16:25:28,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-11-18 16:25:28,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-18 16:25:28,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-11-18 16:25:28,788 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 151 [2018-11-18 16:25:28,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:28,788 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-11-18 16:25:28,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-18 16:25:28,788 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-11-18 16:25:28,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-11-18 16:25:28,789 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:28,789 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:28,789 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:28,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:28,789 INFO L82 PathProgramCache]: Analyzing trace with hash 483163804, now seen corresponding path program 24 times [2018-11-18 16:25:28,789 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:28,789 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:28,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:28,790 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:28,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:28,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:25:29,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-11-18 16:25:29,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:25:29,028 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 16:25:29,034 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-18 16:25:29,092 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-11-18 16:25:29,092 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:25:29,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:25:29,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-11-18 16:25:29,143 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 16:25:29,143 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-11-18 16:25:29,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-18 16:25:29,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-18 16:25:29,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=457, Unknown=0, NotChecked=0, Total=812 [2018-11-18 16:25:29,144 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 29 states. [2018-11-18 16:25:29,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:25:29,406 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2018-11-18 16:25:29,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-18 16:25:29,406 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 157 [2018-11-18 16:25:29,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:25:29,407 INFO L225 Difference]: With dead ends: 94 [2018-11-18 16:25:29,407 INFO L226 Difference]: Without dead ends: 90 [2018-11-18 16:25:29,407 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=1055, Invalid=1807, Unknown=0, NotChecked=0, Total=2862 [2018-11-18 16:25:29,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-18 16:25:29,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-11-18 16:25:29,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-18 16:25:29,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-11-18 16:25:29,410 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 157 [2018-11-18 16:25:29,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:25:29,410 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-11-18 16:25:29,410 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-18 16:25:29,410 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-11-18 16:25:29,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-11-18 16:25:29,410 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:25:29,410 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:25:29,411 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:25:29,411 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:25:29,411 INFO L82 PathProgramCache]: Analyzing trace with hash 1060706820, now seen corresponding path program 25 times [2018-11-18 16:25:29,411 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 16:25:29,411 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 16:25:29,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:29,411 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:25:29,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:25:29,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 16:25:29,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 16:25:29,459 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-18 16:25:29,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 04:25:29 BoogieIcfgContainer [2018-11-18 16:25:29,492 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 16:25:29,492 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 16:25:29,492 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 16:25:29,492 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 16:25:29,493 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 04:25:20" (3/4) ... [2018-11-18 16:25:29,497 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-18 16:25:29,543 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_d5d70be1-1904-478b-a3c1-a3090d17f5ca/bin-2019/uautomizer/witness.graphml [2018-11-18 16:25:29,543 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 16:25:29,543 INFO L168 Benchmark]: Toolchain (without parser) took 9623.60 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 296.7 MB). Free memory was 959.2 MB in the beginning and 1.3 GB in the end (delta: -300.5 MB). There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 16:25:29,545 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 16:25:29,546 INFO L168 Benchmark]: CACSL2BoogieTranslator took 133.31 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 948.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-18 16:25:29,546 INFO L168 Benchmark]: Boogie Preprocessor took 17.55 ms. Allocated memory is still 1.0 GB. Free memory was 948.5 MB in the beginning and 945.8 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 16:25:29,546 INFO L168 Benchmark]: RCFGBuilder took 182.86 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 151.5 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -191.0 MB). Peak memory consumption was 19.4 MB. Max. memory is 11.5 GB. [2018-11-18 16:25:29,546 INFO L168 Benchmark]: TraceAbstraction took 9236.54 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 145.2 MB). Free memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: -131.2 MB). Peak memory consumption was 14.1 MB. Max. memory is 11.5 GB. [2018-11-18 16:25:29,547 INFO L168 Benchmark]: Witness Printer took 50.65 ms. Allocated memory is still 1.3 GB. Free memory was 1.3 GB in the beginning and 1.3 GB in the end (delta: 8.3 MB). Peak memory consumption was 8.3 MB. Max. memory is 11.5 GB. [2018-11-18 16:25:29,548 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 133.31 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 948.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 17.55 ms. Allocated memory is still 1.0 GB. Free memory was 948.5 MB in the beginning and 945.8 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 182.86 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 151.5 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -191.0 MB). Peak memory consumption was 19.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 9236.54 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 145.2 MB). Free memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: -131.2 MB). Peak memory consumption was 14.1 MB. Max. memory is 11.5 GB. * Witness Printer took 50.65 ms. Allocated memory is still 1.3 GB. Free memory was 1.3 GB in the beginning and 1.3 GB in the end (delta: 8.3 MB). Peak memory consumption was 8.3 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 = 25; [L13] int b = 0; VAL [a=25, b=0] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=25] [L4] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=25, m=0, n=25] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=24] [L4] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=24, m=1, n=24] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=23] [L4] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=23, m=2, n=23] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=22] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=22, m=3, n=22] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=21] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=21, m=4, n=21] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=20] [L4] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=20, m=5, n=20] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=19] [L4] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=19, m=6, n=19] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=18] [L4] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=18, m=7, n=18] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=17] [L4] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=17, m=8, n=17] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=16] [L4] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=16, m=9, n=16] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=15] [L4] COND FALSE !(n <= 0) VAL [\old(m)=10, \old(n)=15, m=10, n=15] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=14] [L4] COND FALSE !(n <= 0) VAL [\old(m)=11, \old(n)=14, m=11, n=14] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=13] [L4] COND FALSE !(n <= 0) VAL [\old(m)=12, \old(n)=13, m=12, n=13] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=12] [L4] COND FALSE !(n <= 0) VAL [\old(m)=13, \old(n)=12, m=13, n=12] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=11] [L4] COND FALSE !(n <= 0) VAL [\old(m)=14, \old(n)=11, m=14, n=11] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=10] [L4] COND FALSE !(n <= 0) VAL [\old(m)=15, \old(n)=10, m=15, n=10] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=16, \old(n)=9] [L4] COND FALSE !(n <= 0) VAL [\old(m)=16, \old(n)=9, m=16, n=9] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=17, \old(n)=8] [L4] COND FALSE !(n <= 0) VAL [\old(m)=17, \old(n)=8, m=17, n=8] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=18, \old(n)=7] [L4] COND FALSE !(n <= 0) VAL [\old(m)=18, \old(n)=7, m=18, n=7] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=19, \old(n)=6] [L4] COND FALSE !(n <= 0) VAL [\old(m)=19, \old(n)=6, m=19, n=6] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=20, \old(n)=5] [L4] COND FALSE !(n <= 0) VAL [\old(m)=20, \old(n)=5, m=20, n=5] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=21, \old(n)=4] [L4] COND FALSE !(n <= 0) VAL [\old(m)=21, \old(n)=4, m=21, n=4] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=22, \old(n)=3] [L4] COND FALSE !(n <= 0) VAL [\old(m)=22, \old(n)=3, m=22, n=3] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=23, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=23, \old(n)=2, m=23, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=24, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=24, \old(n)=1, m=24, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=25, \old(n)=0] [L4] COND TRUE n <= 0 [L5] RET return m + n; VAL [\old(m)=25, \old(n)=0, \result=25, m=25, n=0] [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=24, \old(n)=1, m=24, n=1, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=23, \old(n)=2, m=23, n=2, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=22, \old(n)=3, m=22, n=3, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=21, \old(n)=4, m=21, n=4, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=20, \old(n)=5, m=20, n=5, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=19, \old(n)=6, m=19, n=6, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=18, \old(n)=7, m=18, n=7, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=17, \old(n)=8, m=17, n=8, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=16, \old(n)=9, m=16, n=9, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=10, m=15, n=10, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=11, m=14, n=11, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=12, m=13, n=12, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=13, m=12, n=13, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=14, m=11, n=14, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=15, m=10, n=15, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=16, m=9, n=16, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=17, m=8, n=17, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=18, m=7, n=18, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=19, m=6, n=19, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=20, m=5, n=20, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=21, m=4, n=21, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=22, m=3, n=22, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=23, m=2, n=23, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=24, m=1, n=24, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=25, m=0, n=25, sum(n - 1, m + 1)=25] [L7] RET return sum(n - 1, m + 1); [L14] EXPR sum(a, b) VAL [a=25, b=0, sum(a, b)=25] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=25, b=0, result=25] [L16] __VERIFIER_error() VAL [a=25, b=0, result=25] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 9.1s OverallTime, 26 OverallIterations, 26 TraceHistogramMax, 3.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 303 SDtfs, 778 SDslu, 2713 SDs, 0 SdLazy, 2093 SolverSat, 35 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3138 GetRequests, 2438 SyntacticMatches, 0 SemanticMatches, 700 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2600 ImplicationChecksByTransitivity, 4.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=90occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 25 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 3.5s InterpolantComputationTime, 4400 NumberOfCodeBlocks, 4400 NumberOfCodeBlocksAsserted, 222 NumberOfCheckSat, 4188 ConstructedInterpolants, 0 QuantifiedInterpolants, 1139760 SizeOfPredicates, 348 NumberOfNonLiveVariables, 6288 ConjunctsInSsa, 696 ConjunctsInUnsatCore, 49 InterpolantComputations, 1 PerfectInterpolantSequences, 15000/30000 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...