./Ultimate.py --spec ../../sv-benchmarks/c/NoOverflows.prp --file ../../sv-benchmarks/c/recursive/recHanoi03_true-unreach-call_true-no-overflow_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/recHanoi03_true-unreach-call_true-no-overflow_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 887ada769b510ae5d273618525924110908f2b5f .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis No suitable file found in config dir /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/config using search string *Overflow*32bit*_Bitvector*.epf No suitable settings file found using Overflow*32bit*_Bitvector ERROR: UNSUPPORTED PROPERTY Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. stderr output: (error "out of memory") --- Real Ultimate output --- This is Ultimate 0.1.23-5842f4b [2018-11-18 12:41:52,438 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 12:41:52,440 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 12:41:52,446 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 12:41:52,446 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 12:41:52,446 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 12:41:52,447 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 12:41:52,448 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 12:41:52,448 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 12:41:52,449 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 12:41:52,449 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 12:41:52,450 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 12:41:52,450 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 12:41:52,451 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 12:41:52,452 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 12:41:52,452 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 12:41:52,453 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 12:41:52,454 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 12:41:52,455 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 12:41:52,456 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 12:41:52,457 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 12:41:52,458 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 12:41:52,459 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 12:41:52,460 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 12:41:52,460 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 12:41:52,460 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 12:41:52,461 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 12:41:52,462 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 12:41:52,464 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 12:41:52,464 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 12:41:52,464 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 12:41:52,465 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 12:41:52,465 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 12:41:52,465 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 12:41:52,465 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 12:41:52,466 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 12:41:52,466 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/config/svcomp-Overflow-32bit-Taipan_Default.epf [2018-11-18 12:41:52,474 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 12:41:52,474 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 12:41:52,474 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 12:41:52,475 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-18 12:41:52,475 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-18 12:41:52,475 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-18 12:41:52,475 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-18 12:41:52,475 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-18 12:41:52,475 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-18 12:41:52,475 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-18 12:41:52,476 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-18 12:41:52,476 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-18 12:41:52,476 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-18 12:41:52,476 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 12:41:52,476 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 12:41:52,477 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-11-18 12:41:52,477 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 12:41:52,477 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 12:41:52,477 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 12:41:52,477 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 12:41:52,477 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 12:41:52,477 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 12:41:52,478 INFO L133 SettingsManager]: * Check absence of signed integer overflows=true [2018-11-18 12:41:52,478 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 12:41:52,478 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 12:41:52,478 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 12:41:52,478 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 12:41:52,478 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 12:41:52,478 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 12:41:52,479 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 12:41:52,479 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 12:41:52,479 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 12:41:52,479 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 12:41:52,479 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 12:41:52,479 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 12:41:52,479 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-18 12:41:52,479 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 12:41:52,480 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 12:41:52,480 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-18 12:41:52,480 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 887ada769b510ae5d273618525924110908f2b5f [2018-11-18 12:41:52,503 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 12:41:52,512 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 12:41:52,514 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 12:41:52,516 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 12:41:52,516 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 12:41:52,516 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/../../sv-benchmarks/c/recursive/recHanoi03_true-unreach-call_true-no-overflow_true-termination.c [2018-11-18 12:41:52,556 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/data/bb366f68a/11019b5471ce458aad8783cf452a4e84/FLAG662244275 [2018-11-18 12:41:52,949 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 12:41:52,950 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/sv-benchmarks/c/recursive/recHanoi03_true-unreach-call_true-no-overflow_true-termination.c [2018-11-18 12:41:52,954 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/data/bb366f68a/11019b5471ce458aad8783cf452a4e84/FLAG662244275 [2018-11-18 12:41:52,964 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/data/bb366f68a/11019b5471ce458aad8783cf452a4e84 [2018-11-18 12:41:52,966 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 12:41:52,967 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-18 12:41:52,967 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 12:41:52,967 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 12:41:52,970 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 12:41:52,971 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 12:41:52" (1/1) ... [2018-11-18 12:41:52,972 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27f427c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:52, skipping insertion in model container [2018-11-18 12:41:52,972 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 12:41:52" (1/1) ... [2018-11-18 12:41:52,978 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 12:41:52,990 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 12:41:53,094 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 12:41:53,096 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 12:41:53,106 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 12:41:53,114 INFO L195 MainTranslator]: Completed translation [2018-11-18 12:41:53,114 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53 WrapperNode [2018-11-18 12:41:53,114 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 12:41:53,115 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-18 12:41:53,115 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-18 12:41:53,115 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-18 12:41:53,120 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,123 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,128 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-18 12:41:53,129 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 12:41:53,129 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 12:41:53,129 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 12:41:53,134 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,134 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,134 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,134 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,136 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,137 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... [2018-11-18 12:41:53,138 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 12:41:53,139 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 12:41:53,139 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 12:41:53,139 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 12:41:53,139 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 12:41:53,209 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 12:41:53,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 12:41:53,209 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2018-11-18 12:41:53,209 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2018-11-18 12:41:53,209 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 12:41:53,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 12:41:53,210 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 12:41:53,210 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 12:41:53,307 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 12:41:53,307 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 12:41:53 BoogieIcfgContainer [2018-11-18 12:41:53,307 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 12:41:53,308 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 12:41:53,308 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 12:41:53,310 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 12:41:53,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 12:41:52" (1/3) ... [2018-11-18 12:41:53,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cf127ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 12:41:53, skipping insertion in model container [2018-11-18 12:41:53,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 12:41:53" (2/3) ... [2018-11-18 12:41:53,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cf127ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 12:41:53, skipping insertion in model container [2018-11-18 12:41:53,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 12:41:53" (3/3) ... [2018-11-18 12:41:53,312 INFO L112 eAbstractionObserver]: Analyzing ICFG recHanoi03_true-unreach-call_true-no-overflow_true-termination.c [2018-11-18 12:41:53,318 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 12:41:53,323 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 6 error locations. [2018-11-18 12:41:53,333 INFO L257 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2018-11-18 12:41:53,358 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 12:41:53,358 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 12:41:53,359 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 12:41:53,359 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 12:41:53,359 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 12:41:53,359 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 12:41:53,359 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 12:41:53,359 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 12:41:53,373 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2018-11-18 12:41:53,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-18 12:41:53,378 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:53,379 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:53,381 INFO L423 AbstractCegarLoop]: === Iteration 1 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:53,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:53,385 INFO L82 PathProgramCache]: Analyzing trace with hash 1002909108, now seen corresponding path program 1 times [2018-11-18 12:41:53,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:53,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:53,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:53,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:53,417 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:53,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:53,495 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 12:41:53,497 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 12:41:53,497 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-18 12:41:53,498 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 12:41:53,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 12:41:53,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 12:41:53,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 12:41:53,514 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 5 states. [2018-11-18 12:41:53,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:53,575 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-11-18 12:41:53,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 12:41:53,577 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2018-11-18 12:41:53,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:53,584 INFO L225 Difference]: With dead ends: 38 [2018-11-18 12:41:53,584 INFO L226 Difference]: Without dead ends: 24 [2018-11-18 12:41:53,587 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 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 12:41:53,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-18 12:41:53,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-18 12:41:53,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-18 12:41:53,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-18 12:41:53,612 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 10 [2018-11-18 12:41:53,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:53,612 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-18 12:41:53,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 12:41:53,612 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-18 12:41:53,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-18 12:41:53,613 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:53,613 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:53,613 INFO L423 AbstractCegarLoop]: === Iteration 2 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:53,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:53,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1025411315, now seen corresponding path program 1 times [2018-11-18 12:41:53,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:53,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:53,615 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:53,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:53,615 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:53,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:53,654 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 12:41:53,654 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 12:41:53,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-18 12:41:53,654 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 12:41:53,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 12:41:53,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 12:41:53,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 12:41:53,656 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 5 states. [2018-11-18 12:41:53,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:53,731 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2018-11-18 12:41:53,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 12:41:53,731 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-11-18 12:41:53,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:53,733 INFO L225 Difference]: With dead ends: 43 [2018-11-18 12:41:53,733 INFO L226 Difference]: Without dead ends: 40 [2018-11-18 12:41:53,734 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 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 12:41:53,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-11-18 12:41:53,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2018-11-18 12:41:53,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-18 12:41:53,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2018-11-18 12:41:53,741 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 11 [2018-11-18 12:41:53,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:53,742 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2018-11-18 12:41:53,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 12:41:53,742 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2018-11-18 12:41:53,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-18 12:41:53,743 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:53,743 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:53,744 INFO L423 AbstractCegarLoop]: === Iteration 3 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:53,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:53,744 INFO L82 PathProgramCache]: Analyzing trace with hash -80939849, now seen corresponding path program 1 times [2018-11-18 12:41:53,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:53,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:53,745 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:53,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:53,745 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:53,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:53,806 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:53,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:53,807 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:53,807 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-11-18 12:41:53,809 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [7], [8], [9], [24], [28], [38], [40], [41], [42], [44] [2018-11-18 12:41:53,831 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 12:41:53,831 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 12:41:53,918 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-18 12:41:53,919 INFO L272 AbstractInterpreter]: Visited 13 different actions 31 times. Never merged. Never widened. Performed 60 root evaluator evaluations with a maximum evaluation depth of 3. Performed 60 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-11-18 12:41:53,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:53,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-18 12:41:53,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:53,924 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:53,929 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:53,930 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 12:41:53,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:53,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:53,954 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:53,955 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:54,002 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:54,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-11-18 12:41:54,017 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:54,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 12:41:54,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 12:41:54,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2018-11-18 12:41:54,018 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2018-11-18 12:41:54,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:54,093 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2018-11-18 12:41:54,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 12:41:54,093 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2018-11-18 12:41:54,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:54,094 INFO L225 Difference]: With dead ends: 59 [2018-11-18 12:41:54,094 INFO L226 Difference]: Without dead ends: 58 [2018-11-18 12:41:54,094 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=146, Unknown=0, NotChecked=0, Total=210 [2018-11-18 12:41:54,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-11-18 12:41:54,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2018-11-18 12:41:54,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-18 12:41:54,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2018-11-18 12:41:54,099 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 16 [2018-11-18 12:41:54,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:54,099 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2018-11-18 12:41:54,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 12:41:54,099 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2018-11-18 12:41:54,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-18 12:41:54,100 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:54,100 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:54,100 INFO L423 AbstractCegarLoop]: === Iteration 4 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:54,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:54,100 INFO L82 PathProgramCache]: Analyzing trace with hash -474289655, now seen corresponding path program 1 times [2018-11-18 12:41:54,100 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:54,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,101 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:54,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,101 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:54,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:54,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 12:41:54,127 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 12:41:54,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 12:41:54,127 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 12:41:54,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-18 12:41:54,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-18 12:41:54,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-11-18 12:41:54,128 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand 4 states. [2018-11-18 12:41:54,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:54,150 INFO L93 Difference]: Finished difference Result 67 states and 87 transitions. [2018-11-18 12:41:54,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 12:41:54,150 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-11-18 12:41:54,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:54,152 INFO L225 Difference]: With dead ends: 67 [2018-11-18 12:41:54,152 INFO L226 Difference]: Without dead ends: 65 [2018-11-18 12:41:54,152 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-11-18 12:41:54,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-11-18 12:41:54,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2018-11-18 12:41:54,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-11-18 12:41:54,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 76 transitions. [2018-11-18 12:41:54,160 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 76 transitions. Word has length 18 [2018-11-18 12:41:54,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:54,160 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 76 transitions. [2018-11-18 12:41:54,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-18 12:41:54,160 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 76 transitions. [2018-11-18 12:41:54,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-18 12:41:54,161 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:54,161 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:54,161 INFO L423 AbstractCegarLoop]: === Iteration 5 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:54,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:54,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1818077372, now seen corresponding path program 1 times [2018-11-18 12:41:54,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:54,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,162 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:54,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,163 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:54,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:54,196 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 12:41:54,197 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 12:41:54,197 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 12:41:54,197 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 12:41:54,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-18 12:41:54,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-18 12:41:54,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-11-18 12:41:54,197 INFO L87 Difference]: Start difference. First operand 62 states and 76 transitions. Second operand 4 states. [2018-11-18 12:41:54,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:54,209 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2018-11-18 12:41:54,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 12:41:54,209 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2018-11-18 12:41:54,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:54,210 INFO L225 Difference]: With dead ends: 62 [2018-11-18 12:41:54,210 INFO L226 Difference]: Without dead ends: 53 [2018-11-18 12:41:54,211 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-11-18 12:41:54,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-11-18 12:41:54,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-11-18 12:41:54,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-11-18 12:41:54,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2018-11-18 12:41:54,216 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 19 [2018-11-18 12:41:54,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:54,216 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2018-11-18 12:41:54,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-18 12:41:54,216 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2018-11-18 12:41:54,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-18 12:41:54,217 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:54,217 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:54,217 INFO L423 AbstractCegarLoop]: === Iteration 6 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:54,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:54,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1159773325, now seen corresponding path program 2 times [2018-11-18 12:41:54,218 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:54,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,219 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:54,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,219 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:54,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:54,271 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:54,271 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:54,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:54,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:54,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:54,272 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:54,278 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 12:41:54,278 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 12:41:54,285 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 12:41:54,285 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:54,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:54,292 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:54,370 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:54,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-11-18 12:41:54,388 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:54,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 12:41:54,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 12:41:54,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2018-11-18 12:41:54,389 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand 9 states. [2018-11-18 12:41:54,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:54,467 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2018-11-18 12:41:54,467 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-18 12:41:54,468 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2018-11-18 12:41:54,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:54,468 INFO L225 Difference]: With dead ends: 78 [2018-11-18 12:41:54,468 INFO L226 Difference]: Without dead ends: 77 [2018-11-18 12:41:54,469 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=113, Invalid=267, Unknown=0, NotChecked=0, Total=380 [2018-11-18 12:41:54,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-11-18 12:41:54,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 71. [2018-11-18 12:41:54,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-11-18 12:41:54,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 80 transitions. [2018-11-18 12:41:54,474 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 80 transitions. Word has length 21 [2018-11-18 12:41:54,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:54,475 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 80 transitions. [2018-11-18 12:41:54,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 12:41:54,475 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 80 transitions. [2018-11-18 12:41:54,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-18 12:41:54,476 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:54,476 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:54,476 INFO L423 AbstractCegarLoop]: === Iteration 7 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:54,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:54,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1430047287, now seen corresponding path program 3 times [2018-11-18 12:41:54,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:54,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,477 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:41:54,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,477 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:54,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:54,545 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:54,546 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:54,546 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:54,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:54,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:54,546 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:54,552 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 12:41:54,552 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 12:41:54,558 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 12:41:54,558 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:54,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:54,565 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,565 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:54,661 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:54,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-11-18 12:41:54,676 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:54,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 12:41:54,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 12:41:54,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2018-11-18 12:41:54,676 INFO L87 Difference]: Start difference. First operand 71 states and 80 transitions. Second operand 11 states. [2018-11-18 12:41:54,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:54,776 INFO L93 Difference]: Finished difference Result 98 states and 102 transitions. [2018-11-18 12:41:54,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-18 12:41:54,777 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2018-11-18 12:41:54,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:54,777 INFO L225 Difference]: With dead ends: 98 [2018-11-18 12:41:54,777 INFO L226 Difference]: Without dead ends: 97 [2018-11-18 12:41:54,778 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=197, Invalid=453, Unknown=0, NotChecked=0, Total=650 [2018-11-18 12:41:54,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-18 12:41:54,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 89. [2018-11-18 12:41:54,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-18 12:41:54,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2018-11-18 12:41:54,784 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 26 [2018-11-18 12:41:54,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:54,784 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2018-11-18 12:41:54,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 12:41:54,785 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2018-11-18 12:41:54,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-18 12:41:54,785 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:54,785 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:54,786 INFO L423 AbstractCegarLoop]: === Iteration 8 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:54,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:54,786 INFO L82 PathProgramCache]: Analyzing trace with hash -1529291277, now seen corresponding path program 4 times [2018-11-18 12:41:54,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:54,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:41:54,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:54,787 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:54,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:54,859 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:54,859 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:54,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:54,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:54,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:54,860 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:54,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:54,866 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 12:41:54,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:54,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:54,880 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:54,880 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:55,015 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:55,030 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:55,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-11-18 12:41:55,030 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:55,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-18 12:41:55,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-18 12:41:55,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2018-11-18 12:41:55,032 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand 13 states. [2018-11-18 12:41:55,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:55,141 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2018-11-18 12:41:55,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-18 12:41:55,142 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-11-18 12:41:55,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:55,143 INFO L225 Difference]: With dead ends: 118 [2018-11-18 12:41:55,143 INFO L226 Difference]: Without dead ends: 117 [2018-11-18 12:41:55,143 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=305, Invalid=687, Unknown=0, NotChecked=0, Total=992 [2018-11-18 12:41:55,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-11-18 12:41:55,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 107. [2018-11-18 12:41:55,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-11-18 12:41:55,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 122 transitions. [2018-11-18 12:41:55,150 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 122 transitions. Word has length 31 [2018-11-18 12:41:55,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:55,151 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 122 transitions. [2018-11-18 12:41:55,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-18 12:41:55,151 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 122 transitions. [2018-11-18 12:41:55,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-11-18 12:41:55,152 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:55,152 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:55,152 INFO L423 AbstractCegarLoop]: === Iteration 9 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:55,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:55,152 INFO L82 PathProgramCache]: Analyzing trace with hash -10526561, now seen corresponding path program 1 times [2018-11-18 12:41:55,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:55,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:55,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:55,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:55,154 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:55,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:55,201 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-18 12:41:55,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:55,202 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:55,202 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-11-18 12:41:55,203 INFO L202 CegarAbsIntRunner]: [0], [1], [4], [5], [7], [9], [11], [12], [13], [15], [17], [19], [20], [24], [28], [38], [39], [40], [41], [42], [44] [2018-11-18 12:41:55,204 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 12:41:55,204 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 12:41:55,266 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-18 12:41:55,267 INFO L272 AbstractInterpreter]: Visited 21 different actions 82 times. Merged at 7 different actions 25 times. Never widened. Performed 189 root evaluator evaluations with a maximum evaluation depth of 3. Performed 189 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 2 fixpoints after 2 different actions. Largest state had 4 variables. [2018-11-18 12:41:55,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:55,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-18 12:41:55,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:55,269 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:55,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:55,276 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 12:41:55,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:55,289 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:55,303 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-18 12:41:55,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:55,363 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-18 12:41:55,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:55,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-11-18 12:41:55,388 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:55,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 12:41:55,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 12:41:55,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2018-11-18 12:41:55,388 INFO L87 Difference]: Start difference. First operand 107 states and 122 transitions. Second operand 6 states. [2018-11-18 12:41:55,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:55,410 INFO L93 Difference]: Finished difference Result 153 states and 178 transitions. [2018-11-18 12:41:55,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 12:41:55,410 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2018-11-18 12:41:55,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:55,411 INFO L225 Difference]: With dead ends: 153 [2018-11-18 12:41:55,411 INFO L226 Difference]: Without dead ends: 138 [2018-11-18 12:41:55,412 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2018-11-18 12:41:55,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-11-18 12:41:55,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 133. [2018-11-18 12:41:55,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-11-18 12:41:55,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 148 transitions. [2018-11-18 12:41:55,417 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 148 transitions. Word has length 30 [2018-11-18 12:41:55,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:55,417 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 148 transitions. [2018-11-18 12:41:55,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 12:41:55,417 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 148 transitions. [2018-11-18 12:41:55,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-11-18 12:41:55,418 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:55,418 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:55,418 INFO L423 AbstractCegarLoop]: === Iteration 10 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:55,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:55,418 INFO L82 PathProgramCache]: Analyzing trace with hash 1671413687, now seen corresponding path program 5 times [2018-11-18 12:41:55,418 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:55,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:55,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:55,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:55,419 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:55,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:55,493 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:55,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:55,494 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:55,494 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:55,494 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:55,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:55,494 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:55,503 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 12:41:55,503 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 12:41:55,511 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-18 12:41:55,511 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:55,512 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:55,517 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:55,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:55,643 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:55,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:55,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-11-18 12:41:55,659 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:55,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-18 12:41:55,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-18 12:41:55,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=570, Unknown=0, NotChecked=0, Total=756 [2018-11-18 12:41:55,660 INFO L87 Difference]: Start difference. First operand 133 states and 148 transitions. Second operand 15 states. [2018-11-18 12:41:55,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:55,785 INFO L93 Difference]: Finished difference Result 171 states and 177 transitions. [2018-11-18 12:41:55,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-18 12:41:55,786 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 36 [2018-11-18 12:41:55,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:55,787 INFO L225 Difference]: With dead ends: 171 [2018-11-18 12:41:55,787 INFO L226 Difference]: Without dead ends: 170 [2018-11-18 12:41:55,787 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=405, Invalid=927, Unknown=0, NotChecked=0, Total=1332 [2018-11-18 12:41:55,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2018-11-18 12:41:55,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 158. [2018-11-18 12:41:55,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2018-11-18 12:41:55,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 176 transitions. [2018-11-18 12:41:55,794 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 176 transitions. Word has length 36 [2018-11-18 12:41:55,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:55,794 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 176 transitions. [2018-11-18 12:41:55,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-18 12:41:55,794 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 176 transitions. [2018-11-18 12:41:55,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-18 12:41:55,795 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:55,795 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:55,795 INFO L423 AbstractCegarLoop]: === Iteration 11 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:55,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:55,796 INFO L82 PathProgramCache]: Analyzing trace with hash 829642867, now seen corresponding path program 6 times [2018-11-18 12:41:55,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:55,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:55,796 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:41:55,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:55,796 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:55,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:55,952 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:55,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:55,952 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:55,952 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:55,952 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:55,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:55,952 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:55,959 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 12:41:55,959 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 12:41:55,967 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 12:41:55,967 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:55,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:55,973 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:55,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:56,122 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:56,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:56,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-11-18 12:41:56,137 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:56,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-18 12:41:56,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-18 12:41:56,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=748, Unknown=0, NotChecked=0, Total=992 [2018-11-18 12:41:56,138 INFO L87 Difference]: Start difference. First operand 158 states and 176 transitions. Second operand 17 states. [2018-11-18 12:41:56,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:56,276 INFO L93 Difference]: Finished difference Result 198 states and 205 transitions. [2018-11-18 12:41:56,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-18 12:41:56,277 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2018-11-18 12:41:56,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:56,277 INFO L225 Difference]: With dead ends: 198 [2018-11-18 12:41:56,277 INFO L226 Difference]: Without dead ends: 197 [2018-11-18 12:41:56,278 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=555, Invalid=1251, Unknown=0, NotChecked=0, Total=1806 [2018-11-18 12:41:56,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-11-18 12:41:56,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 183. [2018-11-18 12:41:56,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-11-18 12:41:56,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 204 transitions. [2018-11-18 12:41:56,284 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 204 transitions. Word has length 41 [2018-11-18 12:41:56,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:56,284 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 204 transitions. [2018-11-18 12:41:56,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-18 12:41:56,284 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 204 transitions. [2018-11-18 12:41:56,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-18 12:41:56,285 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:56,285 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:56,285 INFO L423 AbstractCegarLoop]: === Iteration 12 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:56,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:56,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1233481545, now seen corresponding path program 2 times [2018-11-18 12:41:56,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:56,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:56,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:41:56,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:56,287 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:56,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:56,324 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-18 12:41:56,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:56,325 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:56,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:56,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:56,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:56,325 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:56,335 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 12:41:56,335 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 12:41:56,341 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 12:41:56,341 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:56,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:56,360 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-18 12:41:56,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:56,600 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-18 12:41:56,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:56,616 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-11-18 12:41:56,616 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:56,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 12:41:56,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 12:41:56,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-11-18 12:41:56,617 INFO L87 Difference]: Start difference. First operand 183 states and 204 transitions. Second operand 8 states. [2018-11-18 12:41:56,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:56,641 INFO L93 Difference]: Finished difference Result 245 states and 280 transitions. [2018-11-18 12:41:56,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-18 12:41:56,642 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 42 [2018-11-18 12:41:56,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:56,643 INFO L225 Difference]: With dead ends: 245 [2018-11-18 12:41:56,643 INFO L226 Difference]: Without dead ends: 223 [2018-11-18 12:41:56,643 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-11-18 12:41:56,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-11-18 12:41:56,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 216. [2018-11-18 12:41:56,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-11-18 12:41:56,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 237 transitions. [2018-11-18 12:41:56,649 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 237 transitions. Word has length 42 [2018-11-18 12:41:56,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:56,650 INFO L480 AbstractCegarLoop]: Abstraction has 216 states and 237 transitions. [2018-11-18 12:41:56,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 12:41:56,651 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 237 transitions. [2018-11-18 12:41:56,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-18 12:41:56,652 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:56,652 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:56,653 INFO L423 AbstractCegarLoop]: === Iteration 13 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:56,653 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:56,653 INFO L82 PathProgramCache]: Analyzing trace with hash -1326590665, now seen corresponding path program 7 times [2018-11-18 12:41:56,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:56,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:56,654 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:41:56,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:56,654 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:56,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:56,742 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:56,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:56,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:56,743 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:56,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:56,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:56,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:56,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:56,748 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 12:41:56,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:56,755 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:56,761 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:56,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:56,926 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:56,941 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:56,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-11-18 12:41:56,941 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:56,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-18 12:41:56,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-18 12:41:56,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=950, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 12:41:56,942 INFO L87 Difference]: Start difference. First operand 216 states and 237 transitions. Second operand 19 states. [2018-11-18 12:41:57,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:57,099 INFO L93 Difference]: Finished difference Result 265 states and 273 transitions. [2018-11-18 12:41:57,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-18 12:41:57,100 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 46 [2018-11-18 12:41:57,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:57,101 INFO L225 Difference]: With dead ends: 265 [2018-11-18 12:41:57,101 INFO L226 Difference]: Without dead ends: 264 [2018-11-18 12:41:57,102 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=688, Invalid=1568, Unknown=0, NotChecked=0, Total=2256 [2018-11-18 12:41:57,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2018-11-18 12:41:57,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 248. [2018-11-18 12:41:57,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-11-18 12:41:57,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 272 transitions. [2018-11-18 12:41:57,108 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 272 transitions. Word has length 46 [2018-11-18 12:41:57,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:57,109 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 272 transitions. [2018-11-18 12:41:57,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-18 12:41:57,109 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 272 transitions. [2018-11-18 12:41:57,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-18 12:41:57,110 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:57,110 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:57,110 INFO L423 AbstractCegarLoop]: === Iteration 14 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:57,110 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:57,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1256803597, now seen corresponding path program 8 times [2018-11-18 12:41:57,110 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:57,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:57,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:57,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:57,112 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:57,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:57,230 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:57,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:57,231 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:57,231 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:57,231 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:57,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:57,231 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:57,237 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 12:41:57,237 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 12:41:57,259 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-18 12:41:57,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:57,261 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:57,281 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 170 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 12:41:57,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:57,504 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 12:41:57,519 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:57,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 20] total 40 [2018-11-18 12:41:57,519 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:57,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-18 12:41:57,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-18 12:41:57,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2018-11-18 12:41:57,520 INFO L87 Difference]: Start difference. First operand 248 states and 272 transitions. Second operand 22 states. [2018-11-18 12:41:57,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:57,544 INFO L93 Difference]: Finished difference Result 248 states and 272 transitions. [2018-11-18 12:41:57,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 12:41:57,545 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2018-11-18 12:41:57,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:57,546 INFO L225 Difference]: With dead ends: 248 [2018-11-18 12:41:57,546 INFO L226 Difference]: Without dead ends: 247 [2018-11-18 12:41:57,547 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=482, Invalid=1324, Unknown=0, NotChecked=0, Total=1806 [2018-11-18 12:41:57,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-11-18 12:41:57,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2018-11-18 12:41:57,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-11-18 12:41:57,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 271 transitions. [2018-11-18 12:41:57,556 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 271 transitions. Word has length 51 [2018-11-18 12:41:57,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:57,556 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 271 transitions. [2018-11-18 12:41:57,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-18 12:41:57,556 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 271 transitions. [2018-11-18 12:41:57,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-11-18 12:41:57,557 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:57,557 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:57,557 INFO L423 AbstractCegarLoop]: === Iteration 15 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:57,558 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:57,558 INFO L82 PathProgramCache]: Analyzing trace with hash -677419169, now seen corresponding path program 3 times [2018-11-18 12:41:57,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:57,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:57,558 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:41:57,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:57,559 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:57,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:57,601 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2018-11-18 12:41:57,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:57,601 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:57,601 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:57,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:57,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:57,601 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:57,608 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 12:41:57,608 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 12:41:57,615 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 12:41:57,615 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:57,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:57,638 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2018-11-18 12:41:57,638 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:57,856 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2018-11-18 12:41:57,876 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:57,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-11-18 12:41:57,876 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:57,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-18 12:41:57,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-18 12:41:57,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2018-11-18 12:41:57,877 INFO L87 Difference]: Start difference. First operand 247 states and 271 transitions. Second operand 10 states. [2018-11-18 12:41:57,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:57,901 INFO L93 Difference]: Finished difference Result 317 states and 357 transitions. [2018-11-18 12:41:57,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-18 12:41:57,903 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 54 [2018-11-18 12:41:57,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:57,904 INFO L225 Difference]: With dead ends: 317 [2018-11-18 12:41:57,904 INFO L226 Difference]: Without dead ends: 288 [2018-11-18 12:41:57,905 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2018-11-18 12:41:57,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2018-11-18 12:41:57,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 280. [2018-11-18 12:41:57,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-11-18 12:41:57,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 304 transitions. [2018-11-18 12:41:57,914 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 304 transitions. Word has length 54 [2018-11-18 12:41:57,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:57,914 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 304 transitions. [2018-11-18 12:41:57,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-18 12:41:57,914 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 304 transitions. [2018-11-18 12:41:57,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-11-18 12:41:57,915 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:57,915 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:57,915 INFO L423 AbstractCegarLoop]: === Iteration 16 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:57,916 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:57,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1491778423, now seen corresponding path program 4 times [2018-11-18 12:41:57,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:57,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:57,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:41:57,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:57,917 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:57,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:57,970 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-18 12:41:57,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:57,970 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:57,970 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:57,971 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:57,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:57,971 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:57,983 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:57,984 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 12:41:57,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:57,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:58,059 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-18 12:41:58,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:58,470 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-18 12:41:58,487 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:58,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-11-18 12:41:58,487 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:58,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 12:41:58,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 12:41:58,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-11-18 12:41:58,488 INFO L87 Difference]: Start difference. First operand 280 states and 304 transitions. Second operand 12 states. [2018-11-18 12:41:58,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:58,524 INFO L93 Difference]: Finished difference Result 350 states and 390 transitions. [2018-11-18 12:41:58,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 12:41:58,524 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 66 [2018-11-18 12:41:58,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:58,526 INFO L225 Difference]: With dead ends: 350 [2018-11-18 12:41:58,526 INFO L226 Difference]: Without dead ends: 314 [2018-11-18 12:41:58,526 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-11-18 12:41:58,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2018-11-18 12:41:58,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 306. [2018-11-18 12:41:58,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2018-11-18 12:41:58,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 330 transitions. [2018-11-18 12:41:58,532 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 330 transitions. Word has length 66 [2018-11-18 12:41:58,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:58,532 INFO L480 AbstractCegarLoop]: Abstraction has 306 states and 330 transitions. [2018-11-18 12:41:58,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 12:41:58,533 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 330 transitions. [2018-11-18 12:41:58,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-11-18 12:41:58,533 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:58,533 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:58,534 INFO L423 AbstractCegarLoop]: === Iteration 17 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:58,534 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:58,534 INFO L82 PathProgramCache]: Analyzing trace with hash 501489183, now seen corresponding path program 5 times [2018-11-18 12:41:58,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:58,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:58,535 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:41:58,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:58,535 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:58,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:58,604 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2018-11-18 12:41:58,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:58,605 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:58,605 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:58,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:58,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:58,605 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:58,613 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 12:41:58,614 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 12:41:58,626 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-18 12:41:58,626 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:58,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:58,704 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2018-11-18 12:41:58,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:41:59,315 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2018-11-18 12:41:59,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:41:59,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-11-18 12:41:59,330 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:41:59,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-18 12:41:59,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-18 12:41:59,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2018-11-18 12:41:59,331 INFO L87 Difference]: Start difference. First operand 306 states and 330 transitions. Second operand 14 states. [2018-11-18 12:41:59,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:41:59,368 INFO L93 Difference]: Finished difference Result 376 states and 416 transitions. [2018-11-18 12:41:59,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-18 12:41:59,368 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2018-11-18 12:41:59,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:41:59,369 INFO L225 Difference]: With dead ends: 376 [2018-11-18 12:41:59,370 INFO L226 Difference]: Without dead ends: 333 [2018-11-18 12:41:59,370 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 139 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2018-11-18 12:41:59,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2018-11-18 12:41:59,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 325. [2018-11-18 12:41:59,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 325 states. [2018-11-18 12:41:59,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 349 transitions. [2018-11-18 12:41:59,380 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 349 transitions. Word has length 78 [2018-11-18 12:41:59,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:41:59,380 INFO L480 AbstractCegarLoop]: Abstraction has 325 states and 349 transitions. [2018-11-18 12:41:59,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-18 12:41:59,381 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 349 transitions. [2018-11-18 12:41:59,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-11-18 12:41:59,382 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:41:59,382 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:41:59,384 INFO L423 AbstractCegarLoop]: === Iteration 18 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:41:59,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:41:59,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1033999927, now seen corresponding path program 6 times [2018-11-18 12:41:59,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:41:59,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:59,386 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:41:59,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:41:59,386 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:41:59,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:41:59,488 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 0 proven. 129 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2018-11-18 12:41:59,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:59,488 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:41:59,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:41:59,489 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:41:59,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:41:59,489 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:41:59,496 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 12:41:59,496 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 12:41:59,511 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 12:41:59,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:41:59,513 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:41:59,585 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 0 proven. 129 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2018-11-18 12:41:59,585 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:42:00,623 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 0 proven. 129 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2018-11-18 12:42:00,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:42:00,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-11-18 12:42:00,639 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:42:00,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 12:42:00,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 12:42:00,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=631, Unknown=0, NotChecked=0, Total=870 [2018-11-18 12:42:00,640 INFO L87 Difference]: Start difference. First operand 325 states and 349 transitions. Second operand 16 states. [2018-11-18 12:42:00,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:42:00,718 INFO L93 Difference]: Finished difference Result 395 states and 435 transitions. [2018-11-18 12:42:00,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-18 12:42:00,719 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 90 [2018-11-18 12:42:00,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:42:00,720 INFO L225 Difference]: With dead ends: 395 [2018-11-18 12:42:00,720 INFO L226 Difference]: Without dead ends: 345 [2018-11-18 12:42:00,721 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 160 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=239, Invalid=631, Unknown=0, NotChecked=0, Total=870 [2018-11-18 12:42:00,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-11-18 12:42:00,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 337. [2018-11-18 12:42:00,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-11-18 12:42:00,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 361 transitions. [2018-11-18 12:42:00,727 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 361 transitions. Word has length 90 [2018-11-18 12:42:00,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:42:00,727 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 361 transitions. [2018-11-18 12:42:00,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 12:42:00,728 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 361 transitions. [2018-11-18 12:42:00,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-11-18 12:42:00,729 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:42:00,729 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:42:00,729 INFO L423 AbstractCegarLoop]: === Iteration 19 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:42:00,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:42:00,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1169786079, now seen corresponding path program 7 times [2018-11-18 12:42:00,729 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:42:00,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:00,730 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:42:00,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:00,730 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:42:00,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:42:00,816 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 175 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-11-18 12:42:00,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:00,817 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:42:00,817 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:42:00,817 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:42:00,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:00,817 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/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 12:42:00,833 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:42:00,833 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 12:42:00,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:42:00,847 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:42:00,913 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 175 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-11-18 12:42:00,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:42:02,609 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 175 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-11-18 12:42:02,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:42:02,624 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-11-18 12:42:02,624 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:42:02,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-18 12:42:02,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-18 12:42:02,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2018-11-18 12:42:02,625 INFO L87 Difference]: Start difference. First operand 337 states and 361 transitions. Second operand 18 states. [2018-11-18 12:42:02,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:42:02,680 INFO L93 Difference]: Finished difference Result 407 states and 447 transitions. [2018-11-18 12:42:02,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-18 12:42:02,681 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 102 [2018-11-18 12:42:02,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:42:02,682 INFO L225 Difference]: With dead ends: 407 [2018-11-18 12:42:02,683 INFO L226 Difference]: Without dead ends: 352 [2018-11-18 12:42:02,683 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 181 SyntacticMatches, 7 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2018-11-18 12:42:02,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2018-11-18 12:42:02,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 344. [2018-11-18 12:42:02,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 344 states. [2018-11-18 12:42:02,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 368 transitions. [2018-11-18 12:42:02,698 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 368 transitions. Word has length 102 [2018-11-18 12:42:02,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:42:02,698 INFO L480 AbstractCegarLoop]: Abstraction has 344 states and 368 transitions. [2018-11-18 12:42:02,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-18 12:42:02,698 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 368 transitions. [2018-11-18 12:42:02,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-18 12:42:02,700 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:42:02,700 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:42:02,700 INFO L423 AbstractCegarLoop]: === Iteration 20 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:42:02,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:42:02,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1716838153, now seen corresponding path program 8 times [2018-11-18 12:42:02,700 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:42:02,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:02,701 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:42:02,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:02,701 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:42:02,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:42:02,857 INFO L134 CoverageAnalysis]: Checked inductivity of 426 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-18 12:42:02,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:02,858 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:42:02,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:42:02,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:42:02,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:02,858 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/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 12:42:02,867 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 12:42:02,867 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 12:42:02,891 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-18 12:42:02,891 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:42:02,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:42:03,008 INFO L134 CoverageAnalysis]: Checked inductivity of 426 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-18 12:42:03,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:42:05,357 INFO L134 CoverageAnalysis]: Checked inductivity of 426 backedges. 0 proven. 228 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-18 12:42:05,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:42:05,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-11-18 12:42:05,378 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:42:05,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-18 12:42:05,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-18 12:42:05,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=379, Invalid=1027, Unknown=0, NotChecked=0, Total=1406 [2018-11-18 12:42:05,379 INFO L87 Difference]: Start difference. First operand 344 states and 368 transitions. Second operand 20 states. [2018-11-18 12:42:05,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:42:05,464 INFO L93 Difference]: Finished difference Result 414 states and 454 transitions. [2018-11-18 12:42:05,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-18 12:42:05,464 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 114 [2018-11-18 12:42:05,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:42:05,465 INFO L225 Difference]: With dead ends: 414 [2018-11-18 12:42:05,465 INFO L226 Difference]: Without dead ends: 359 [2018-11-18 12:42:05,466 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 202 SyntacticMatches, 8 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=379, Invalid=1027, Unknown=0, NotChecked=0, Total=1406 [2018-11-18 12:42:05,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2018-11-18 12:42:05,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 351. [2018-11-18 12:42:05,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2018-11-18 12:42:05,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 375 transitions. [2018-11-18 12:42:05,474 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 375 transitions. Word has length 114 [2018-11-18 12:42:05,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:42:05,474 INFO L480 AbstractCegarLoop]: Abstraction has 351 states and 375 transitions. [2018-11-18 12:42:05,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-18 12:42:05,474 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 375 transitions. [2018-11-18 12:42:05,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-11-18 12:42:05,476 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:42:05,476 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:42:05,476 INFO L423 AbstractCegarLoop]: === Iteration 21 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:42:05,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:42:05,477 INFO L82 PathProgramCache]: Analyzing trace with hash 497785759, now seen corresponding path program 9 times [2018-11-18 12:42:05,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:42:05,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:05,477 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:42:05,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:05,477 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:42:05,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:42:05,644 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2018-11-18 12:42:05,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:05,645 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:42:05,645 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:42:05,645 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:42:05,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:05,645 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/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 12:42:05,653 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 12:42:05,654 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 12:42:05,669 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 12:42:05,669 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:42:05,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:42:05,791 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2018-11-18 12:42:05,791 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:42:19,469 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 0 proven. 276 refuted. 12 times theorem prover too weak. 245 trivial. 0 not checked. [2018-11-18 12:42:19,484 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:42:19,484 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-11-18 12:42:19,484 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:42:19,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-18 12:42:19,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-18 12:42:19,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=1258, Unknown=3, NotChecked=0, Total=1722 [2018-11-18 12:42:19,485 INFO L87 Difference]: Start difference. First operand 351 states and 375 transitions. Second operand 22 states. [2018-11-18 12:42:19,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:42:19,548 INFO L93 Difference]: Finished difference Result 421 states and 461 transitions. [2018-11-18 12:42:19,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-18 12:42:19,548 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 126 [2018-11-18 12:42:19,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:42:19,549 INFO L225 Difference]: With dead ends: 421 [2018-11-18 12:42:19,549 INFO L226 Difference]: Without dead ends: 366 [2018-11-18 12:42:19,550 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 223 SyntacticMatches, 9 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=461, Invalid=1258, Unknown=3, NotChecked=0, Total=1722 [2018-11-18 12:42:19,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2018-11-18 12:42:19,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 358. [2018-11-18 12:42:19,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 358 states. [2018-11-18 12:42:19,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 382 transitions. [2018-11-18 12:42:19,558 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 382 transitions. Word has length 126 [2018-11-18 12:42:19,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:42:19,558 INFO L480 AbstractCegarLoop]: Abstraction has 358 states and 382 transitions. [2018-11-18 12:42:19,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-18 12:42:19,558 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 382 transitions. [2018-11-18 12:42:19,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-11-18 12:42:19,560 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:42:19,560 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:42:19,561 INFO L423 AbstractCegarLoop]: === Iteration 22 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:42:19,561 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:42:19,561 INFO L82 PathProgramCache]: Analyzing trace with hash -486860283, now seen corresponding path program 10 times [2018-11-18 12:42:19,561 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:42:19,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:19,562 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 12:42:19,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:19,562 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:42:19,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:42:19,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1345 backedges. 0 proven. 355 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-11-18 12:42:19,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:19,717 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:42:19,717 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:42:19,718 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:42:19,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:19,718 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/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 12:42:19,724 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:42:19,724 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 12:42:19,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:42:19,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:42:19,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1345 backedges. 0 proven. 355 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-11-18 12:42:19,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:42:51,471 INFO L134 CoverageAnalysis]: Checked inductivity of 1345 backedges. 0 proven. 351 refuted. 4 times theorem prover too weak. 990 trivial. 0 not checked. [2018-11-18 12:42:51,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 12:42:51,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-11-18 12:42:51,486 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 12:42:51,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-18 12:42:51,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-18 12:42:51,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=547, Invalid=1517, Unknown=6, NotChecked=0, Total=2070 [2018-11-18 12:42:51,487 INFO L87 Difference]: Start difference. First operand 358 states and 382 transitions. Second operand 24 states. [2018-11-18 12:42:51,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 12:42:51,537 INFO L93 Difference]: Finished difference Result 428 states and 468 transitions. [2018-11-18 12:42:51,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-18 12:42:51,537 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 183 [2018-11-18 12:42:51,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 12:42:51,543 INFO L225 Difference]: With dead ends: 428 [2018-11-18 12:42:51,543 INFO L226 Difference]: Without dead ends: 373 [2018-11-18 12:42:51,544 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 334 SyntacticMatches, 10 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 688 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=547, Invalid=1517, Unknown=6, NotChecked=0, Total=2070 [2018-11-18 12:42:51,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2018-11-18 12:42:51,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 365. [2018-11-18 12:42:51,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 365 states. [2018-11-18 12:42:51,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 389 transitions. [2018-11-18 12:42:51,552 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 389 transitions. Word has length 183 [2018-11-18 12:42:51,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 12:42:51,552 INFO L480 AbstractCegarLoop]: Abstraction has 365 states and 389 transitions. [2018-11-18 12:42:51,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-18 12:42:51,552 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 389 transitions. [2018-11-18 12:42:51,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-11-18 12:42:51,554 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 12:42:51,554 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 12:42:51,554 INFO L423 AbstractCegarLoop]: === Iteration 23 === [hanoiErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, hanoiErr3ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 12:42:51,554 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 12:42:51,554 INFO L82 PathProgramCache]: Analyzing trace with hash 881204763, now seen corresponding path program 11 times [2018-11-18 12:42:51,554 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 12:42:51,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:51,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 12:42:51,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 12:42:51,555 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 12:42:51,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 12:42:51,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 1092 trivial. 0 not checked. [2018-11-18 12:42:51,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:51,808 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 12:42:51,808 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 12:42:51,808 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 12:42:51,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 12:42:51,809 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_9e8912c4-0a0c-464c-985f-d13f05b6d551/bin-2019/utaipan/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 12:42:51,820 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 12:42:51,821 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 12:42:51,853 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-18 12:42:51,853 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 12:42:51,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 12:42:52,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 1092 trivial. 0 not checked. [2018-11-18 12:42:52,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 12:43:26,382 WARN L194 Executor]: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000) stderr output: (error "out of memory") [2018-11-18 12:43:26,582 WARN L521 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 12:43:26,583 FATAL L265 ToolchainWalker]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. stderr output: (error "out of memory") at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:208) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseCheckSatResult(Executor.java:225) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.checkSat(Scriptor.java:155) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.WrapperScript.checkSat(WrapperScript.java:116) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.managedscript.ManagedScript.checkSat(ManagedScript.java:141) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.MonolithicImplicationChecker.checkImplication(MonolithicImplicationChecker.java:84) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.compare(PredicateUnifier.java:893) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.(PredicateUnifier.java:767) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:339) at de.uni_freiburg.informatik.ultimate.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:299) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp$UnifyPostprocessor.postprocess(TraceCheckSpWp.java:575) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.computeBackwardSequence(IterativePredicateTransformer.java:418) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.predicates.IterativePredicateTransformer.computeWeakestPreconditionSequence(IterativePredicateTransformer.java:290) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:162) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.constructForwardBackward(TraceCheckConstructor.java:224) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.constructTraceCheck(TraceCheckConstructor.java:188) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceCheckConstructor.get(TraceCheckConstructor.java:165) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseTaipanRefinementStrategy.getTraceCheck(BaseTaipanRefinementStrategy.java:214) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseRefinementStrategy.checkFeasibility(BaseRefinementStrategy.java:223) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.BaseRefinementStrategy.executeStrategy(BaseRefinementStrategy.java:197) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:70) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:434) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:376) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterate(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:123) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1427) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:630) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:419) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:205) ... 40 more [2018-11-18 12:43:26,586 INFO L168 Benchmark]: Toolchain (without parser) took 93619.56 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 319.8 MB). Free memory was 959.2 MB in the beginning and 1.1 GB in the end (delta: -99.4 MB). Peak memory consumption was 220.4 MB. Max. memory is 11.5 GB. [2018-11-18 12:43:26,587 INFO L168 Benchmark]: CDTParser took 0.15 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 12:43:26,587 INFO L168 Benchmark]: CACSL2BoogieTranslator took 147.32 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 12:43:26,587 INFO L168 Benchmark]: Boogie Procedure Inliner took 13.66 ms. Allocated memory is still 1.0 GB. Free memory is still 948.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 12:43:26,587 INFO L168 Benchmark]: Boogie Preprocessor took 9.80 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 12:43:26,588 INFO L168 Benchmark]: RCFGBuilder took 168.82 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 134.2 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -174.3 MB). Peak memory consumption was 14.3 MB. Max. memory is 11.5 GB. [2018-11-18 12:43:26,588 INFO L168 Benchmark]: TraceAbstraction took 93277.17 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 185.6 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 61.4 MB). Peak memory consumption was 247.0 MB. Max. memory is 11.5 GB. [2018-11-18 12:43:26,591 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 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 147.32 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 Procedure Inliner took 13.66 ms. Allocated memory is still 1.0 GB. Free memory is still 948.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 9.80 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 168.82 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 134.2 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -174.3 MB). Peak memory consumption was 14.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 93277.17 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 185.6 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 61.4 MB). Peak memory consumption was 247.0 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. stderr output: (error "out of memory") de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. stderr output: (error "out of memory") : de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:208) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...