./Ultimate.py --spec ../../sv-benchmarks/c/NoOverflows.prp --file ../../sv-benchmarks/c/termination-crafted/NestedRecursion_2c_true-no-overflow_true-termination_true-valid-memsafety.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_2c_true-no-overflow_true-termination_true-valid-memsafety.c -s /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 64bit --witnessprinter.graph.data.programhash 14df269faa4a77275028af94d8141ab36c184cf5 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-5842f4b [2018-11-18 13:25:59,371 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 13:25:59,372 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 13:25:59,379 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 13:25:59,379 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 13:25:59,380 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 13:25:59,381 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 13:25:59,382 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 13:25:59,384 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 13:25:59,384 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 13:25:59,385 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 13:25:59,386 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 13:25:59,386 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 13:25:59,387 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 13:25:59,388 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 13:25:59,389 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 13:25:59,389 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 13:25:59,390 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 13:25:59,392 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 13:25:59,393 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 13:25:59,394 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 13:25:59,395 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 13:25:59,397 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 13:25:59,397 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 13:25:59,397 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 13:25:59,398 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 13:25:59,399 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 13:25:59,400 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 13:25:59,400 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 13:25:59,401 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 13:25:59,401 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 13:25:59,402 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 13:25:59,402 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 13:25:59,402 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 13:25:59,403 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 13:25:59,403 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 13:25:59,404 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf [2018-11-18 13:25:59,414 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 13:25:59,415 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 13:25:59,415 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 13:25:59,415 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-18 13:25:59,415 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-18 13:25:59,416 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-18 13:25:59,416 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-18 13:25:59,416 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-18 13:25:59,416 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-18 13:25:59,416 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-18 13:25:59,416 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-18 13:25:59,416 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-18 13:25:59,417 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-18 13:25:59,417 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 13:25:59,417 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-11-18 13:25:59,418 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 13:25:59,418 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 13:25:59,418 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 13:25:59,418 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 13:25:59,418 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 13:25:59,418 INFO L133 SettingsManager]: * Check absence of signed integer overflows=true [2018-11-18 13:25:59,418 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 13:25:59,419 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 13:25:59,419 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 13:25:59,419 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 13:25:59,419 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 13:25:59,419 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 13:25:59,419 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 13:25:59,419 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 13:25:59,420 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 13:25:59,420 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 13:25:59,420 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 13:25:59,420 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-18 13:25:59,420 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 13:25:59,420 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 13:25:59,420 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-18 13:25:59,420 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_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 14df269faa4a77275028af94d8141ab36c184cf5 [2018-11-18 13:25:59,440 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 13:25:59,450 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 13:25:59,453 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 13:25:59,454 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 13:25:59,454 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 13:25:59,454 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/../../sv-benchmarks/c/termination-crafted/NestedRecursion_2c_true-no-overflow_true-termination_true-valid-memsafety.c [2018-11-18 13:25:59,498 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/data/e1384407f/797019c56ca84fb5a05ff7978f5985fc/FLAGd97738f29 [2018-11-18 13:25:59,896 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 13:25:59,897 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/sv-benchmarks/c/termination-crafted/NestedRecursion_2c_true-no-overflow_true-termination_true-valid-memsafety.c [2018-11-18 13:25:59,900 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/data/e1384407f/797019c56ca84fb5a05ff7978f5985fc/FLAGd97738f29 [2018-11-18 13:25:59,910 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/data/e1384407f/797019c56ca84fb5a05ff7978f5985fc [2018-11-18 13:25:59,912 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 13:25:59,913 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-18 13:25:59,914 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 13:25:59,914 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 13:25:59,917 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 13:25:59,918 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 01:25:59" (1/1) ... [2018-11-18 13:25:59,919 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b708a34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:25:59, skipping insertion in model container [2018-11-18 13:25:59,919 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 01:25:59" (1/1) ... [2018-11-18 13:25:59,925 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 13:25:59,935 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 13:26:00,037 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 13:26:00,039 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 13:26:00,047 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 13:26:00,054 INFO L195 MainTranslator]: Completed translation [2018-11-18 13:26:00,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00 WrapperNode [2018-11-18 13:26:00,055 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 13:26:00,055 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-18 13:26:00,055 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-18 13:26:00,055 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-18 13:26:00,060 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,063 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,066 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-18 13:26:00,067 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 13:26:00,067 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 13:26:00,067 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 13:26:00,072 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,072 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,072 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,072 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,074 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,075 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,076 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... [2018-11-18 13:26:00,077 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 13:26:00,077 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 13:26:00,077 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 13:26:00,077 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 13:26:00,078 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:00,153 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 13:26:00,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 13:26:00,154 INFO L130 BoogieDeclarations]: Found specification of procedure g [2018-11-18 13:26:00,154 INFO L138 BoogieDeclarations]: Found implementation of procedure g [2018-11-18 13:26:00,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 13:26:00,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 13:26:00,154 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 13:26:00,154 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 13:26:00,248 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 13:26:00,248 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:26:00 BoogieIcfgContainer [2018-11-18 13:26:00,248 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 13:26:00,249 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 13:26:00,249 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 13:26:00,251 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 13:26:00,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 01:25:59" (1/3) ... [2018-11-18 13:26:00,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54f669ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 01:26:00, skipping insertion in model container [2018-11-18 13:26:00,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:26:00" (2/3) ... [2018-11-18 13:26:00,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54f669ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 01:26:00, skipping insertion in model container [2018-11-18 13:26:00,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:26:00" (3/3) ... [2018-11-18 13:26:00,254 INFO L112 eAbstractionObserver]: Analyzing ICFG NestedRecursion_2c_true-no-overflow_true-termination_true-valid-memsafety.c [2018-11-18 13:26:00,262 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 13:26:00,267 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-11-18 13:26:00,276 INFO L257 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2018-11-18 13:26:00,293 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 13:26:00,294 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 13:26:00,294 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 13:26:00,294 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 13:26:00,294 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 13:26:00,294 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 13:26:00,294 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 13:26:00,294 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 13:26:00,308 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2018-11-18 13:26:00,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-18 13:26:00,313 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:00,313 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:00,314 INFO L423 AbstractCegarLoop]: === Iteration 1 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:00,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:00,318 INFO L82 PathProgramCache]: Analyzing trace with hash -774276160, now seen corresponding path program 1 times [2018-11-18 13:26:00,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:00,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:00,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:00,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:00,359 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:00,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:00,428 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 13:26:00,430 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:00,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-18 13:26:00,430 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:00,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 13:26:00,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 13:26:00,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 13:26:00,447 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2018-11-18 13:26:00,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:00,528 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2018-11-18 13:26:00,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 13:26:00,529 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2018-11-18 13:26:00,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:00,536 INFO L225 Difference]: With dead ends: 46 [2018-11-18 13:26:00,536 INFO L226 Difference]: Without dead ends: 40 [2018-11-18 13:26:00,539 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 13:26:00,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-11-18 13:26:00,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2018-11-18 13:26:00,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-11-18 13:26:00,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2018-11-18 13:26:00,570 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 10 [2018-11-18 13:26:00,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:00,570 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2018-11-18 13:26:00,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 13:26:00,570 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2018-11-18 13:26:00,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-18 13:26:00,571 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:00,571 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:00,571 INFO L423 AbstractCegarLoop]: === Iteration 2 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:00,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:00,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1767242855, now seen corresponding path program 1 times [2018-11-18 13:26:00,572 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:00,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:00,573 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:00,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:00,573 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:00,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:00,610 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 13:26:00,610 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:00,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-18 13:26:00,610 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:00,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 13:26:00,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 13:26:00,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 13:26:00,611 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand 5 states. [2018-11-18 13:26:00,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:00,678 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2018-11-18 13:26:00,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 13:26:00,679 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-11-18 13:26:00,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:00,680 INFO L225 Difference]: With dead ends: 54 [2018-11-18 13:26:00,680 INFO L226 Difference]: Without dead ends: 50 [2018-11-18 13:26:00,681 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 13:26:00,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-11-18 13:26:00,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2018-11-18 13:26:00,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-11-18 13:26:00,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2018-11-18 13:26:00,689 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 11 [2018-11-18 13:26:00,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:00,690 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2018-11-18 13:26:00,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 13:26:00,690 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2018-11-18 13:26:00,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-18 13:26:00,690 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:00,690 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:00,691 INFO L423 AbstractCegarLoop]: === Iteration 3 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:00,691 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:00,691 INFO L82 PathProgramCache]: Analyzing trace with hash -601436741, now seen corresponding path program 1 times [2018-11-18 13:26:00,691 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:00,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:00,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:00,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:00,692 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:00,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:00,746 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 13:26:00,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:00,747 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:00,748 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-11-18 13:26:00,750 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [7], [8], [9], [22], [26], [30], [34], [35], [36], [38] [2018-11-18 13:26:00,778 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 13:26:00,778 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 13:26:00,852 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-18 13:26:00,853 INFO L272 AbstractInterpreter]: Visited 13 different actions 31 times. Never merged. Never widened. Performed 58 root evaluator evaluations with a maximum evaluation depth of 3. Performed 58 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 13:26:00,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:00,867 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-18 13:26:00,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:00,867 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:00,875 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:00,875 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:26:00,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:00,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:00,904 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 13:26:00,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:00,958 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 13:26:00,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:00,983 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-11-18 13:26:00,983 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:00,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 13:26:00,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 13:26:00,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2018-11-18 13:26:00,984 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand 7 states. [2018-11-18 13:26:01,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:01,059 INFO L93 Difference]: Finished difference Result 67 states and 81 transitions. [2018-11-18 13:26:01,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 13:26:01,060 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2018-11-18 13:26:01,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:01,060 INFO L225 Difference]: With dead ends: 67 [2018-11-18 13:26:01,060 INFO L226 Difference]: Without dead ends: 66 [2018-11-18 13:26:01,061 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 13:26:01,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-18 13:26:01,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2018-11-18 13:26:01,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-11-18 13:26:01,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2018-11-18 13:26:01,068 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 16 [2018-11-18 13:26:01,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:01,068 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2018-11-18 13:26:01,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 13:26:01,068 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2018-11-18 13:26:01,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-18 13:26:01,069 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:01,069 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 13:26:01,069 INFO L423 AbstractCegarLoop]: === Iteration 4 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:01,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:01,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1839303495, now seen corresponding path program 1 times [2018-11-18 13:26:01,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:01,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:01,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,071 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:01,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:01,084 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 13:26:01,084 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:01,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-18 13:26:01,085 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:01,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-18 13:26:01,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-18 13:26:01,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 13:26:01,086 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand 3 states. [2018-11-18 13:26:01,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:01,097 INFO L93 Difference]: Finished difference Result 56 states and 70 transitions. [2018-11-18 13:26:01,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-18 13:26:01,097 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2018-11-18 13:26:01,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:01,098 INFO L225 Difference]: With dead ends: 56 [2018-11-18 13:26:01,098 INFO L226 Difference]: Without dead ends: 55 [2018-11-18 13:26:01,099 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 13:26:01,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-11-18 13:26:01,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-11-18 13:26:01,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-18 13:26:01,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2018-11-18 13:26:01,106 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 18 [2018-11-18 13:26:01,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:01,107 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2018-11-18 13:26:01,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-18 13:26:01,107 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2018-11-18 13:26:01,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-18 13:26:01,107 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:01,107 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 13:26:01,108 INFO L423 AbstractCegarLoop]: === Iteration 5 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:01,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:01,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1183833542, now seen corresponding path program 1 times [2018-11-18 13:26:01,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:01,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,109 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:01,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,109 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:01,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:01,137 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 13:26:01,137 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:01,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 13:26:01,138 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:01,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-18 13:26:01,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-18 13:26:01,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-11-18 13:26:01,138 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand 4 states. [2018-11-18 13:26:01,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:01,161 INFO L93 Difference]: Finished difference Result 81 states and 105 transitions. [2018-11-18 13:26:01,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 13:26:01,161 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2018-11-18 13:26:01,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:01,162 INFO L225 Difference]: With dead ends: 81 [2018-11-18 13:26:01,162 INFO L226 Difference]: Without dead ends: 80 [2018-11-18 13:26:01,163 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 13:26:01,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-11-18 13:26:01,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 73. [2018-11-18 13:26:01,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-11-18 13:26:01,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2018-11-18 13:26:01,172 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 19 [2018-11-18 13:26:01,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:01,172 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2018-11-18 13:26:01,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-18 13:26:01,172 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2018-11-18 13:26:01,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-18 13:26:01,172 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:01,173 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:01,173 INFO L423 AbstractCegarLoop]: === Iteration 6 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:01,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:01,173 INFO L82 PathProgramCache]: Analyzing trace with hash -544755481, now seen corresponding path program 2 times [2018-11-18 13:26:01,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:01,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,174 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:01,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,174 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:01,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:01,241 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 13:26:01,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:01,242 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:01,242 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:01,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:01,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:01,242 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:01,251 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:26:01,251 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:26:01,260 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 13:26:01,260 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:01,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:01,267 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 13:26:01,267 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:01,336 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 13:26:01,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:01,355 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-11-18 13:26:01,355 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:01,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 13:26:01,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 13:26:01,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2018-11-18 13:26:01,356 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand 9 states. [2018-11-18 13:26:01,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:01,452 INFO L93 Difference]: Finished difference Result 94 states and 110 transitions. [2018-11-18 13:26:01,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 13:26:01,453 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2018-11-18 13:26:01,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:01,454 INFO L225 Difference]: With dead ends: 94 [2018-11-18 13:26:01,454 INFO L226 Difference]: Without dead ends: 93 [2018-11-18 13:26:01,454 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2018-11-18 13:26:01,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-18 13:26:01,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2018-11-18 13:26:01,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-18 13:26:01,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 109 transitions. [2018-11-18 13:26:01,461 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 109 transitions. Word has length 21 [2018-11-18 13:26:01,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:01,462 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 109 transitions. [2018-11-18 13:26:01,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 13:26:01,462 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 109 transitions. [2018-11-18 13:26:01,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-18 13:26:01,462 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:01,463 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:01,463 INFO L423 AbstractCegarLoop]: === Iteration 7 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:01,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:01,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1671679351, now seen corresponding path program 1 times [2018-11-18 13:26:01,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:01,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:01,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,464 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:01,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:01,493 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 13:26:01,494 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:01,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 13:26:01,494 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:01,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 13:26:01,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 13:26:01,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-18 13:26:01,495 INFO L87 Difference]: Start difference. First operand 90 states and 109 transitions. Second operand 6 states. [2018-11-18 13:26:01,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:01,595 INFO L93 Difference]: Finished difference Result 121 states and 153 transitions. [2018-11-18 13:26:01,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 13:26:01,595 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2018-11-18 13:26:01,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:01,596 INFO L225 Difference]: With dead ends: 121 [2018-11-18 13:26:01,596 INFO L226 Difference]: Without dead ends: 120 [2018-11-18 13:26:01,597 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-11-18 13:26:01,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-11-18 13:26:01,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 113. [2018-11-18 13:26:01,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-11-18 13:26:01,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 147 transitions. [2018-11-18 13:26:01,606 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 147 transitions. Word has length 23 [2018-11-18 13:26:01,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:01,606 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 147 transitions. [2018-11-18 13:26:01,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 13:26:01,607 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 147 transitions. [2018-11-18 13:26:01,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-18 13:26:01,607 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:01,607 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:01,608 INFO L423 AbstractCegarLoop]: === Iteration 8 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:01,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:01,608 INFO L82 PathProgramCache]: Analyzing trace with hash -282452290, now seen corresponding path program 1 times [2018-11-18 13:26:01,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:01,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,609 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:01,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,609 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:01,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:01,636 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 13:26:01,636 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:01,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 13:26:01,636 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:01,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 13:26:01,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 13:26:01,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-18 13:26:01,637 INFO L87 Difference]: Start difference. First operand 113 states and 147 transitions. Second operand 6 states. [2018-11-18 13:26:01,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:01,734 INFO L93 Difference]: Finished difference Result 139 states and 178 transitions. [2018-11-18 13:26:01,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 13:26:01,735 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2018-11-18 13:26:01,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:01,735 INFO L225 Difference]: With dead ends: 139 [2018-11-18 13:26:01,736 INFO L226 Difference]: Without dead ends: 138 [2018-11-18 13:26:01,736 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-11-18 13:26:01,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-11-18 13:26:01,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 129. [2018-11-18 13:26:01,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-11-18 13:26:01,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 164 transitions. [2018-11-18 13:26:01,749 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 164 transitions. Word has length 24 [2018-11-18 13:26:01,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:01,749 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 164 transitions. [2018-11-18 13:26:01,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 13:26:01,749 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 164 transitions. [2018-11-18 13:26:01,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-18 13:26:01,750 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:01,750 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:01,750 INFO L423 AbstractCegarLoop]: === Iteration 9 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:01,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:01,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1622021829, now seen corresponding path program 3 times [2018-11-18 13:26:01,751 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:01,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:01,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:01,751 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:01,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:01,815 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 13:26:01,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:01,815 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:01,816 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:01,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:01,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:01,816 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:01,822 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:26:01,822 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:26:01,830 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:26:01,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:01,831 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:01,856 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-18 13:26:01,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:01,962 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 13:26:01,977 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:01,977 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 10] total 20 [2018-11-18 13:26:01,977 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:01,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 13:26:01,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 13:26:01,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2018-11-18 13:26:01,978 INFO L87 Difference]: Start difference. First operand 129 states and 164 transitions. Second operand 12 states. [2018-11-18 13:26:02,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:02,021 INFO L93 Difference]: Finished difference Result 133 states and 171 transitions. [2018-11-18 13:26:02,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-18 13:26:02,021 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2018-11-18 13:26:02,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:02,022 INFO L225 Difference]: With dead ends: 133 [2018-11-18 13:26:02,022 INFO L226 Difference]: Without dead ends: 132 [2018-11-18 13:26:02,023 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:26:02,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-11-18 13:26:02,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 129. [2018-11-18 13:26:02,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-11-18 13:26:02,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 163 transitions. [2018-11-18 13:26:02,032 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 163 transitions. Word has length 26 [2018-11-18 13:26:02,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:02,033 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 163 transitions. [2018-11-18 13:26:02,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 13:26:02,033 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 163 transitions. [2018-11-18 13:26:02,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-18 13:26:02,033 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:02,034 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:02,034 INFO L423 AbstractCegarLoop]: === Iteration 10 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:02,034 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:02,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1947044292, now seen corresponding path program 2 times [2018-11-18 13:26:02,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:02,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,035 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:02,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,035 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:02,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:02,071 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 13:26:02,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:02,071 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:02,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:02,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:02,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:02,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:02,084 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:26:02,084 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:26:02,094 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-18 13:26:02,094 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:02,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:02,100 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 13:26:02,100 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:02,150 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 13:26:02,165 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:02,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-11-18 13:26:02,165 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:02,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 13:26:02,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 13:26:02,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2018-11-18 13:26:02,166 INFO L87 Difference]: Start difference. First operand 129 states and 163 transitions. Second operand 8 states. [2018-11-18 13:26:02,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:02,314 INFO L93 Difference]: Finished difference Result 159 states and 202 transitions. [2018-11-18 13:26:02,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-18 13:26:02,314 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2018-11-18 13:26:02,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:02,315 INFO L225 Difference]: With dead ends: 159 [2018-11-18 13:26:02,315 INFO L226 Difference]: Without dead ends: 158 [2018-11-18 13:26:02,316 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2018-11-18 13:26:02,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-11-18 13:26:02,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 147. [2018-11-18 13:26:02,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-11-18 13:26:02,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 186 transitions. [2018-11-18 13:26:02,326 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 186 transitions. Word has length 29 [2018-11-18 13:26:02,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:02,326 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 186 transitions. [2018-11-18 13:26:02,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 13:26:02,326 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 186 transitions. [2018-11-18 13:26:02,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-11-18 13:26:02,327 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:02,327 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:02,328 INFO L423 AbstractCegarLoop]: === Iteration 11 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:02,328 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:02,328 INFO L82 PathProgramCache]: Analyzing trace with hash 634524286, now seen corresponding path program 3 times [2018-11-18 13:26:02,328 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:02,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,329 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:02,329 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,329 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:02,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:02,390 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 13:26:02,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:02,391 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:02,391 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:02,391 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:02,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:02,391 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:02,403 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:26:02,403 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:26:02,410 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:26:02,410 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:02,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:02,431 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-11-18 13:26:02,431 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:02,440 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-11-18 13:26:02,455 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-18 13:26:02,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [9] total 14 [2018-11-18 13:26:02,456 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:02,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 13:26:02,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 13:26:02,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2018-11-18 13:26:02,457 INFO L87 Difference]: Start difference. First operand 147 states and 186 transitions. Second operand 6 states. [2018-11-18 13:26:02,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:02,506 INFO L93 Difference]: Finished difference Result 201 states and 264 transitions. [2018-11-18 13:26:02,506 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 13:26:02,506 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-11-18 13:26:02,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:02,507 INFO L225 Difference]: With dead ends: 201 [2018-11-18 13:26:02,507 INFO L226 Difference]: Without dead ends: 97 [2018-11-18 13:26:02,509 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-11-18 13:26:02,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-18 13:26:02,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2018-11-18 13:26:02,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-11-18 13:26:02,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 113 transitions. [2018-11-18 13:26:02,516 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 113 transitions. Word has length 34 [2018-11-18 13:26:02,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:02,516 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 113 transitions. [2018-11-18 13:26:02,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 13:26:02,516 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 113 transitions. [2018-11-18 13:26:02,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-18 13:26:02,517 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:02,517 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:02,518 INFO L423 AbstractCegarLoop]: === Iteration 12 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:02,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:02,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1824264805, now seen corresponding path program 1 times [2018-11-18 13:26:02,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:02,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:02,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,519 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:02,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:02,550 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:02,550 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:02,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-18 13:26:02,550 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:02,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 13:26:02,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 13:26:02,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 13:26:02,555 INFO L87 Difference]: Start difference. First operand 93 states and 113 transitions. Second operand 5 states. [2018-11-18 13:26:02,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:02,605 INFO L93 Difference]: Finished difference Result 93 states and 113 transitions. [2018-11-18 13:26:02,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 13:26:02,606 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2018-11-18 13:26:02,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:02,607 INFO L225 Difference]: With dead ends: 93 [2018-11-18 13:26:02,607 INFO L226 Difference]: Without dead ends: 92 [2018-11-18 13:26:02,608 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-18 13:26:02,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-11-18 13:26:02,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2018-11-18 13:26:02,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-11-18 13:26:02,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 108 transitions. [2018-11-18 13:26:02,620 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 108 transitions. Word has length 35 [2018-11-18 13:26:02,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:02,620 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 108 transitions. [2018-11-18 13:26:02,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 13:26:02,620 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 108 transitions. [2018-11-18 13:26:02,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-18 13:26:02,621 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:02,621 INFO L375 BasicCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:02,622 INFO L423 AbstractCegarLoop]: === Iteration 13 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:02,622 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:02,622 INFO L82 PathProgramCache]: Analyzing trace with hash -1307639896, now seen corresponding path program 1 times [2018-11-18 13:26:02,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:02,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:02,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,623 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:02,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:02,658 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-18 13:26:02,659 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:02,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-18 13:26:02,659 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:02,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 13:26:02,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 13:26:02,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 13:26:02,660 INFO L87 Difference]: Start difference. First operand 92 states and 108 transitions. Second operand 5 states. [2018-11-18 13:26:02,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:02,704 INFO L93 Difference]: Finished difference Result 92 states and 108 transitions. [2018-11-18 13:26:02,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 13:26:02,705 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-11-18 13:26:02,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:02,706 INFO L225 Difference]: With dead ends: 92 [2018-11-18 13:26:02,706 INFO L226 Difference]: Without dead ends: 91 [2018-11-18 13:26:02,706 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-11-18 13:26:02,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-11-18 13:26:02,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-11-18 13:26:02,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-11-18 13:26:02,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2018-11-18 13:26:02,714 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 39 [2018-11-18 13:26:02,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:02,715 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2018-11-18 13:26:02,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 13:26:02,715 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2018-11-18 13:26:02,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-11-18 13:26:02,716 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:02,716 INFO L375 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:02,716 INFO L423 AbstractCegarLoop]: === Iteration 14 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:02,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:02,716 INFO L82 PathProgramCache]: Analyzing trace with hash -1882131073, now seen corresponding path program 1 times [2018-11-18 13:26:02,716 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:02,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:02,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,717 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:02,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:02,761 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:02,761 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:26:02,761 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-18 13:26:02,761 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:02,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 13:26:02,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 13:26:02,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-11-18 13:26:02,763 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand 7 states. [2018-11-18 13:26:02,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:02,881 INFO L93 Difference]: Finished difference Result 110 states and 130 transitions. [2018-11-18 13:26:02,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-18 13:26:02,882 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2018-11-18 13:26:02,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:02,883 INFO L225 Difference]: With dead ends: 110 [2018-11-18 13:26:02,883 INFO L226 Difference]: Without dead ends: 109 [2018-11-18 13:26:02,883 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2018-11-18 13:26:02,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-11-18 13:26:02,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2018-11-18 13:26:02,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-11-18 13:26:02,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 123 transitions. [2018-11-18 13:26:02,890 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 123 transitions. Word has length 40 [2018-11-18 13:26:02,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:02,890 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 123 transitions. [2018-11-18 13:26:02,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 13:26:02,890 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 123 transitions. [2018-11-18 13:26:02,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-11-18 13:26:02,891 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:02,891 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:02,891 INFO L423 AbstractCegarLoop]: === Iteration 15 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:02,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:02,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1047280733, now seen corresponding path program 2 times [2018-11-18 13:26:02,892 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:02,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,892 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:02,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:02,893 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:02,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:02,939 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 34 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:02,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:02,940 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:02,940 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:02,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:02,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:02,940 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:02,953 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:26:02,953 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:26:02,967 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-18 13:26:02,967 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:02,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:02,974 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 34 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:02,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:03,081 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 34 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:03,106 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:03,106 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-11-18 13:26:03,106 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:03,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 13:26:03,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 13:26:03,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2018-11-18 13:26:03,107 INFO L87 Difference]: Start difference. First operand 107 states and 123 transitions. Second operand 9 states. [2018-11-18 13:26:03,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:03,256 INFO L93 Difference]: Finished difference Result 126 states and 145 transitions. [2018-11-18 13:26:03,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-18 13:26:03,257 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 45 [2018-11-18 13:26:03,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:03,258 INFO L225 Difference]: With dead ends: 126 [2018-11-18 13:26:03,258 INFO L226 Difference]: Without dead ends: 125 [2018-11-18 13:26:03,259 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=180, Invalid=522, Unknown=0, NotChecked=0, Total=702 [2018-11-18 13:26:03,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-11-18 13:26:03,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2018-11-18 13:26:03,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-11-18 13:26:03,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 144 transitions. [2018-11-18 13:26:03,267 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 144 transitions. Word has length 45 [2018-11-18 13:26:03,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:03,268 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 144 transitions. [2018-11-18 13:26:03,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 13:26:03,268 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 144 transitions. [2018-11-18 13:26:03,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-18 13:26:03,268 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:03,269 INFO L375 BasicCegarLoop]: trace histogram [7, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:03,269 INFO L423 AbstractCegarLoop]: === Iteration 16 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:03,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:03,269 INFO L82 PathProgramCache]: Analyzing trace with hash 483404799, now seen corresponding path program 3 times [2018-11-18 13:26:03,269 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:03,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:03,270 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:03,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:03,270 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:03,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:03,315 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 48 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:03,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:03,315 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:03,315 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:03,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:03,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:03,315 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:03,322 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:26:03,322 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:26:03,331 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:26:03,331 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:03,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:03,341 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 48 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:03,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:03,432 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 48 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:03,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:03,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-11-18 13:26:03,448 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:03,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 13:26:03,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 13:26:03,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2018-11-18 13:26:03,449 INFO L87 Difference]: Start difference. First operand 125 states and 144 transitions. Second operand 11 states. [2018-11-18 13:26:03,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:03,674 INFO L93 Difference]: Finished difference Result 144 states and 166 transitions. [2018-11-18 13:26:03,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-18 13:26:03,675 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 50 [2018-11-18 13:26:03,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:03,676 INFO L225 Difference]: With dead ends: 144 [2018-11-18 13:26:03,676 INFO L226 Difference]: Without dead ends: 143 [2018-11-18 13:26:03,676 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=334, Invalid=926, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 13:26:03,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-11-18 13:26:03,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2018-11-18 13:26:03,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-11-18 13:26:03,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 165 transitions. [2018-11-18 13:26:03,683 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 165 transitions. Word has length 50 [2018-11-18 13:26:03,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:03,683 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 165 transitions. [2018-11-18 13:26:03,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 13:26:03,683 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 165 transitions. [2018-11-18 13:26:03,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-18 13:26:03,684 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:03,684 INFO L375 BasicCegarLoop]: trace histogram [8, 6, 6, 5, 5, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:03,684 INFO L423 AbstractCegarLoop]: === Iteration 17 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:03,684 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:03,685 INFO L82 PathProgramCache]: Analyzing trace with hash 2081594659, now seen corresponding path program 4 times [2018-11-18 13:26:03,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:03,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:03,685 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:03,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:03,686 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:03,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:03,755 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 62 proven. 27 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:03,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:03,755 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:03,756 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:03,756 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:03,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:03,756 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:03,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:03,762 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:26:03,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:03,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:03,778 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 62 proven. 27 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:03,778 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:03,899 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 62 proven. 27 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:03,914 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:03,914 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-11-18 13:26:03,914 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:03,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-18 13:26:03,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-18 13:26:03,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2018-11-18 13:26:03,915 INFO L87 Difference]: Start difference. First operand 143 states and 165 transitions. Second operand 13 states. [2018-11-18 13:26:04,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:04,147 INFO L93 Difference]: Finished difference Result 162 states and 187 transitions. [2018-11-18 13:26:04,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-18 13:26:04,147 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2018-11-18 13:26:04,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:04,148 INFO L225 Difference]: With dead ends: 162 [2018-11-18 13:26:04,148 INFO L226 Difference]: Without dead ends: 161 [2018-11-18 13:26:04,148 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=538, Invalid=1442, Unknown=0, NotChecked=0, Total=1980 [2018-11-18 13:26:04,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2018-11-18 13:26:04,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 161. [2018-11-18 13:26:04,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-11-18 13:26:04,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 186 transitions. [2018-11-18 13:26:04,155 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 186 transitions. Word has length 55 [2018-11-18 13:26:04,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:04,155 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 186 transitions. [2018-11-18 13:26:04,155 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-18 13:26:04,155 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 186 transitions. [2018-11-18 13:26:04,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-11-18 13:26:04,156 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:04,156 INFO L375 BasicCegarLoop]: trace histogram [9, 7, 7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:04,156 INFO L423 AbstractCegarLoop]: === Iteration 18 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:04,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:04,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1729970815, now seen corresponding path program 5 times [2018-11-18 13:26:04,157 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:04,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:04,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:04,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:04,158 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:04,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:04,233 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 76 proven. 46 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:04,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:04,233 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:04,233 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:04,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:04,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:04,233 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:04,251 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:26:04,251 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:26:04,286 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-18 13:26:04,286 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:04,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:04,295 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 76 proven. 46 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:04,295 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:04,461 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 76 proven. 46 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:04,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:04,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-11-18 13:26:04,486 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:04,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-18 13:26:04,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-18 13:26:04,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=610, Unknown=0, NotChecked=0, Total=756 [2018-11-18 13:26:04,487 INFO L87 Difference]: Start difference. First operand 161 states and 186 transitions. Second operand 15 states. [2018-11-18 13:26:04,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:04,810 INFO L93 Difference]: Finished difference Result 180 states and 208 transitions. [2018-11-18 13:26:04,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-18 13:26:04,810 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 60 [2018-11-18 13:26:04,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:04,811 INFO L225 Difference]: With dead ends: 180 [2018-11-18 13:26:04,811 INFO L226 Difference]: Without dead ends: 179 [2018-11-18 13:26:04,812 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=792, Invalid=2070, Unknown=0, NotChecked=0, Total=2862 [2018-11-18 13:26:04,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-11-18 13:26:04,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-11-18 13:26:04,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-11-18 13:26:04,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 207 transitions. [2018-11-18 13:26:04,821 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 207 transitions. Word has length 60 [2018-11-18 13:26:04,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:04,821 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 207 transitions. [2018-11-18 13:26:04,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-18 13:26:04,822 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 207 transitions. [2018-11-18 13:26:04,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-18 13:26:04,822 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:04,822 INFO L375 BasicCegarLoop]: trace histogram [10, 8, 8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:04,823 INFO L423 AbstractCegarLoop]: === Iteration 19 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:04,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:04,823 INFO L82 PathProgramCache]: Analyzing trace with hash -17852765, now seen corresponding path program 6 times [2018-11-18 13:26:04,823 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:04,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:04,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:04,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:04,824 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:04,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:04,922 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 90 proven. 70 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:04,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:04,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:04,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:04,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:04,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:04,923 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:04,935 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:26:04,935 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:26:04,945 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:26:04,945 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:04,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:04,954 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 90 proven. 70 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:04,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:05,146 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 90 proven. 70 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:05,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:05,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-11-18 13:26:05,162 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:05,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-18 13:26:05,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-18 13:26:05,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=796, Unknown=0, NotChecked=0, Total=992 [2018-11-18 13:26:05,163 INFO L87 Difference]: Start difference. First operand 179 states and 207 transitions. Second operand 17 states. [2018-11-18 13:26:05,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:05,602 INFO L93 Difference]: Finished difference Result 198 states and 229 transitions. [2018-11-18 13:26:05,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-18 13:26:05,603 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2018-11-18 13:26:05,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:05,604 INFO L225 Difference]: With dead ends: 198 [2018-11-18 13:26:05,604 INFO L226 Difference]: Without dead ends: 197 [2018-11-18 13:26:05,605 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1096, Invalid=2810, Unknown=0, NotChecked=0, Total=3906 [2018-11-18 13:26:05,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-11-18 13:26:05,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2018-11-18 13:26:05,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-11-18 13:26:05,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 228 transitions. [2018-11-18 13:26:05,611 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 228 transitions. Word has length 65 [2018-11-18 13:26:05,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:05,612 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 228 transitions. [2018-11-18 13:26:05,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-18 13:26:05,612 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 228 transitions. [2018-11-18 13:26:05,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-11-18 13:26:05,613 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:05,613 INFO L375 BasicCegarLoop]: trace histogram [11, 9, 9, 8, 8, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:05,613 INFO L423 AbstractCegarLoop]: === Iteration 20 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:05,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:05,613 INFO L82 PathProgramCache]: Analyzing trace with hash 249575679, now seen corresponding path program 7 times [2018-11-18 13:26:05,613 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:05,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:05,614 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:05,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:05,614 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:05,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:05,717 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 104 proven. 99 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:05,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:05,717 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:05,718 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:05,718 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:05,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:05,718 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:05,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:05,725 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:26:05,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:05,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:05,746 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 104 proven. 99 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:05,746 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:06,001 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 104 proven. 99 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:06,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:06,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-11-18 13:26:06,016 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:06,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-18 13:26:06,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-18 13:26:06,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1006, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 13:26:06,017 INFO L87 Difference]: Start difference. First operand 197 states and 228 transitions. Second operand 19 states. [2018-11-18 13:26:06,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:06,426 INFO L93 Difference]: Finished difference Result 216 states and 250 transitions. [2018-11-18 13:26:06,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-18 13:26:06,427 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 70 [2018-11-18 13:26:06,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:06,428 INFO L225 Difference]: With dead ends: 216 [2018-11-18 13:26:06,428 INFO L226 Difference]: Without dead ends: 215 [2018-11-18 13:26:06,429 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 956 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1450, Invalid=3662, Unknown=0, NotChecked=0, Total=5112 [2018-11-18 13:26:06,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-11-18 13:26:06,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2018-11-18 13:26:06,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-11-18 13:26:06,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 249 transitions. [2018-11-18 13:26:06,438 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 249 transitions. Word has length 70 [2018-11-18 13:26:06,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:06,438 INFO L480 AbstractCegarLoop]: Abstraction has 215 states and 249 transitions. [2018-11-18 13:26:06,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-18 13:26:06,439 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 249 transitions. [2018-11-18 13:26:06,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-11-18 13:26:06,439 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:06,440 INFO L375 BasicCegarLoop]: trace histogram [12, 10, 10, 9, 9, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:06,440 INFO L423 AbstractCegarLoop]: === Iteration 21 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:06,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:06,440 INFO L82 PathProgramCache]: Analyzing trace with hash -2096975837, now seen corresponding path program 8 times [2018-11-18 13:26:06,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:06,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:06,441 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:06,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:06,441 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:06,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:06,568 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 118 proven. 133 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:06,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:06,568 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:06,568 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:06,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:06,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:06,569 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:06,577 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:26:06,577 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:26:06,599 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-18 13:26:06,599 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:06,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:06,611 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 118 proven. 133 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:06,611 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:06,860 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 118 proven. 133 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:06,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:06,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-11-18 13:26:06,884 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:06,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-18 13:26:06,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-18 13:26:06,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=1240, Unknown=0, NotChecked=0, Total=1560 [2018-11-18 13:26:06,885 INFO L87 Difference]: Start difference. First operand 215 states and 249 transitions. Second operand 21 states. [2018-11-18 13:26:07,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:07,414 INFO L93 Difference]: Finished difference Result 234 states and 271 transitions. [2018-11-18 13:26:07,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-18 13:26:07,414 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 75 [2018-11-18 13:26:07,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:07,415 INFO L225 Difference]: With dead ends: 234 [2018-11-18 13:26:07,415 INFO L226 Difference]: Without dead ends: 233 [2018-11-18 13:26:07,416 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1245 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1854, Invalid=4626, Unknown=0, NotChecked=0, Total=6480 [2018-11-18 13:26:07,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2018-11-18 13:26:07,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 233. [2018-11-18 13:26:07,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2018-11-18 13:26:07,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 270 transitions. [2018-11-18 13:26:07,422 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 270 transitions. Word has length 75 [2018-11-18 13:26:07,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:07,422 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 270 transitions. [2018-11-18 13:26:07,422 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-18 13:26:07,423 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 270 transitions. [2018-11-18 13:26:07,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-18 13:26:07,424 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:07,424 INFO L375 BasicCegarLoop]: trace histogram [13, 11, 11, 10, 10, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:07,424 INFO L423 AbstractCegarLoop]: === Iteration 22 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:07,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:07,424 INFO L82 PathProgramCache]: Analyzing trace with hash -1572794497, now seen corresponding path program 9 times [2018-11-18 13:26:07,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:07,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:07,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:07,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:07,425 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:07,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:07,561 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 132 proven. 172 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:07,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:07,562 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:07,562 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:07,562 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:07,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:07,562 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:07,568 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:26:07,568 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:26:07,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:26:07,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:07,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:07,590 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 132 proven. 172 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:07,590 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:07,884 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 132 proven. 172 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:07,900 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:07,900 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-11-18 13:26:07,900 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:07,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-18 13:26:07,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-18 13:26:07,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=1498, Unknown=0, NotChecked=0, Total=1892 [2018-11-18 13:26:07,901 INFO L87 Difference]: Start difference. First operand 233 states and 270 transitions. Second operand 23 states. [2018-11-18 13:26:08,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:08,424 INFO L93 Difference]: Finished difference Result 252 states and 292 transitions. [2018-11-18 13:26:08,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-11-18 13:26:08,425 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 80 [2018-11-18 13:26:08,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:08,426 INFO L225 Difference]: With dead ends: 252 [2018-11-18 13:26:08,426 INFO L226 Difference]: Without dead ends: 251 [2018-11-18 13:26:08,428 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1573 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=2308, Invalid=5702, Unknown=0, NotChecked=0, Total=8010 [2018-11-18 13:26:08,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2018-11-18 13:26:08,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2018-11-18 13:26:08,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2018-11-18 13:26:08,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 291 transitions. [2018-11-18 13:26:08,435 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 291 transitions. Word has length 80 [2018-11-18 13:26:08,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:08,436 INFO L480 AbstractCegarLoop]: Abstraction has 251 states and 291 transitions. [2018-11-18 13:26:08,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-18 13:26:08,436 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 291 transitions. [2018-11-18 13:26:08,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-18 13:26:08,437 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:08,437 INFO L375 BasicCegarLoop]: trace histogram [14, 12, 12, 11, 11, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:08,438 INFO L423 AbstractCegarLoop]: === Iteration 23 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:08,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:08,438 INFO L82 PathProgramCache]: Analyzing trace with hash 321120675, now seen corresponding path program 10 times [2018-11-18 13:26:08,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:08,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:08,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:08,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:08,439 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:08,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:08,629 INFO L134 CoverageAnalysis]: Checked inductivity of 379 backedges. 146 proven. 216 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:08,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:08,630 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:08,630 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:08,630 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:08,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:08,630 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:08,638 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:08,639 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:26:08,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:08,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:08,663 INFO L134 CoverageAnalysis]: Checked inductivity of 379 backedges. 146 proven. 216 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:08,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:09,026 INFO L134 CoverageAnalysis]: Checked inductivity of 379 backedges. 146 proven. 216 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:09,050 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:09,050 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-11-18 13:26:09,050 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:09,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-18 13:26:09,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-18 13:26:09,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=1780, Unknown=0, NotChecked=0, Total=2256 [2018-11-18 13:26:09,051 INFO L87 Difference]: Start difference. First operand 251 states and 291 transitions. Second operand 25 states. [2018-11-18 13:26:09,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:09,707 INFO L93 Difference]: Finished difference Result 270 states and 313 transitions. [2018-11-18 13:26:09,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-11-18 13:26:09,708 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 85 [2018-11-18 13:26:09,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:09,709 INFO L225 Difference]: With dead ends: 270 [2018-11-18 13:26:09,709 INFO L226 Difference]: Without dead ends: 269 [2018-11-18 13:26:09,711 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1901 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=2812, Invalid=6890, Unknown=0, NotChecked=0, Total=9702 [2018-11-18 13:26:09,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2018-11-18 13:26:09,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2018-11-18 13:26:09,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-11-18 13:26:09,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 312 transitions. [2018-11-18 13:26:09,717 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 312 transitions. Word has length 85 [2018-11-18 13:26:09,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:09,717 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 312 transitions. [2018-11-18 13:26:09,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-18 13:26:09,718 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 312 transitions. [2018-11-18 13:26:09,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-11-18 13:26:09,719 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:09,719 INFO L375 BasicCegarLoop]: trace histogram [15, 13, 13, 12, 12, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:09,719 INFO L423 AbstractCegarLoop]: === Iteration 24 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:09,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:09,719 INFO L82 PathProgramCache]: Analyzing trace with hash 493340159, now seen corresponding path program 11 times [2018-11-18 13:26:09,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:09,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:09,720 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:09,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:09,720 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:09,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:09,902 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 160 proven. 265 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:09,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:09,903 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:09,903 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:09,903 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:09,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:09,903 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:09,909 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:26:09,909 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:26:09,924 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-18 13:26:09,924 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:09,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:09,934 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 160 proven. 265 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:09,934 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:10,319 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 160 proven. 265 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:10,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:10,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-11-18 13:26:10,335 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:10,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-18 13:26:10,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-18 13:26:10,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=2086, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 13:26:10,336 INFO L87 Difference]: Start difference. First operand 269 states and 312 transitions. Second operand 27 states. [2018-11-18 13:26:11,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:11,101 INFO L93 Difference]: Finished difference Result 288 states and 334 transitions. [2018-11-18 13:26:11,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-11-18 13:26:11,101 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 90 [2018-11-18 13:26:11,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:11,102 INFO L225 Difference]: With dead ends: 288 [2018-11-18 13:26:11,102 INFO L226 Difference]: Without dead ends: 287 [2018-11-18 13:26:11,104 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2331 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=3366, Invalid=8190, Unknown=0, NotChecked=0, Total=11556 [2018-11-18 13:26:11,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-11-18 13:26:11,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2018-11-18 13:26:11,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-11-18 13:26:11,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 333 transitions. [2018-11-18 13:26:11,115 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 333 transitions. Word has length 90 [2018-11-18 13:26:11,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:11,115 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 333 transitions. [2018-11-18 13:26:11,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-18 13:26:11,115 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 333 transitions. [2018-11-18 13:26:11,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-11-18 13:26:11,116 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:11,116 INFO L375 BasicCegarLoop]: trace histogram [16, 14, 14, 13, 13, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:11,117 INFO L423 AbstractCegarLoop]: === Iteration 25 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:11,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:11,117 INFO L82 PathProgramCache]: Analyzing trace with hash 204161827, now seen corresponding path program 12 times [2018-11-18 13:26:11,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:11,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:11,118 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:11,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:11,118 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:11,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:11,388 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 174 proven. 319 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:11,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:11,388 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:11,388 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:11,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:11,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:11,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:11,402 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:26:11,402 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:26:11,418 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:26:11,418 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:11,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:11,434 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 174 proven. 319 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:11,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:12,039 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 174 proven. 319 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:12,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:12,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-11-18 13:26:12,057 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:12,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-18 13:26:12,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-18 13:26:12,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2416, Unknown=0, NotChecked=0, Total=3080 [2018-11-18 13:26:12,058 INFO L87 Difference]: Start difference. First operand 287 states and 333 transitions. Second operand 29 states. [2018-11-18 13:26:13,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:13,042 INFO L93 Difference]: Finished difference Result 306 states and 355 transitions. [2018-11-18 13:26:13,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-11-18 13:26:13,042 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 95 [2018-11-18 13:26:13,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:13,043 INFO L225 Difference]: With dead ends: 306 [2018-11-18 13:26:13,043 INFO L226 Difference]: Without dead ends: 305 [2018-11-18 13:26:13,045 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2771 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=3970, Invalid=9602, Unknown=0, NotChecked=0, Total=13572 [2018-11-18 13:26:13,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2018-11-18 13:26:13,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 305. [2018-11-18 13:26:13,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2018-11-18 13:26:13,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 354 transitions. [2018-11-18 13:26:13,052 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 354 transitions. Word has length 95 [2018-11-18 13:26:13,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:13,052 INFO L480 AbstractCegarLoop]: Abstraction has 305 states and 354 transitions. [2018-11-18 13:26:13,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-18 13:26:13,052 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 354 transitions. [2018-11-18 13:26:13,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-11-18 13:26:13,053 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:13,054 INFO L375 BasicCegarLoop]: trace histogram [17, 15, 15, 14, 14, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:13,054 INFO L423 AbstractCegarLoop]: === Iteration 26 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:13,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:13,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1786535039, now seen corresponding path program 13 times [2018-11-18 13:26:13,054 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:13,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:13,055 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:26:13,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:13,055 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:13,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:13,264 INFO L134 CoverageAnalysis]: Checked inductivity of 583 backedges. 188 proven. 378 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:13,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:13,265 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:13,265 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:13,265 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:13,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:13,265 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:13,271 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:13,271 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:26:13,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:13,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:13,291 INFO L134 CoverageAnalysis]: Checked inductivity of 583 backedges. 188 proven. 378 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:13,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:13,735 INFO L134 CoverageAnalysis]: Checked inductivity of 583 backedges. 188 proven. 378 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:13,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:26:13,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-11-18 13:26:13,750 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:26:13,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-18 13:26:13,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-18 13:26:13,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=2770, Unknown=0, NotChecked=0, Total=3540 [2018-11-18 13:26:13,751 INFO L87 Difference]: Start difference. First operand 305 states and 354 transitions. Second operand 31 states. [2018-11-18 13:26:14,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:14,644 INFO L93 Difference]: Finished difference Result 324 states and 376 transitions. [2018-11-18 13:26:14,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-11-18 13:26:14,644 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 100 [2018-11-18 13:26:14,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:14,645 INFO L225 Difference]: With dead ends: 324 [2018-11-18 13:26:14,645 INFO L226 Difference]: Without dead ends: 323 [2018-11-18 13:26:14,646 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3243 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=4624, Invalid=11126, Unknown=0, NotChecked=0, Total=15750 [2018-11-18 13:26:14,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2018-11-18 13:26:14,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 323. [2018-11-18 13:26:14,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2018-11-18 13:26:14,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 375 transitions. [2018-11-18 13:26:14,654 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 375 transitions. Word has length 100 [2018-11-18 13:26:14,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:14,654 INFO L480 AbstractCegarLoop]: Abstraction has 323 states and 375 transitions. [2018-11-18 13:26:14,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-18 13:26:14,654 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 375 transitions. [2018-11-18 13:26:14,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-11-18 13:26:14,655 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:26:14,655 INFO L375 BasicCegarLoop]: trace histogram [18, 16, 16, 15, 15, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:26:14,655 INFO L423 AbstractCegarLoop]: === Iteration 27 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2018-11-18 13:26:14,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:26:14,656 INFO L82 PathProgramCache]: Analyzing trace with hash -1661944669, now seen corresponding path program 14 times [2018-11-18 13:26:14,656 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:26:14,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:14,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:26:14,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:26:14,656 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:26:14,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:26:14,938 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 202 proven. 442 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2018-11-18 13:26:14,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:14,939 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:26:14,939 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:26:14,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:26:14,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:26:14,939 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/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 13:26:14,946 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:26:14,946 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:26:14,961 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-18 13:26:14,961 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:26:14,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:26:15,012 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 228 proven. 0 refuted. 0 times theorem prover too weak. 433 trivial. 0 not checked. [2018-11-18 13:26:15,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:26:15,036 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 228 proven. 0 refuted. 0 times theorem prover too weak. 433 trivial. 0 not checked. [2018-11-18 13:26:15,051 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-18 13:26:15,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [32] total 38 [2018-11-18 13:26:15,051 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:26:15,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 13:26:15,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 13:26:15,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=1120, Unknown=0, NotChecked=0, Total=1406 [2018-11-18 13:26:15,051 INFO L87 Difference]: Start difference. First operand 323 states and 375 transitions. Second operand 7 states. [2018-11-18 13:26:15,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:26:15,089 INFO L93 Difference]: Finished difference Result 356 states and 414 transitions. [2018-11-18 13:26:15,089 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 13:26:15,089 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 105 [2018-11-18 13:26:15,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:26:15,090 INFO L225 Difference]: With dead ends: 356 [2018-11-18 13:26:15,090 INFO L226 Difference]: Without dead ends: 0 [2018-11-18 13:26:15,091 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=379, Invalid=1343, Unknown=0, NotChecked=0, Total=1722 [2018-11-18 13:26:15,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-18 13:26:15,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-18 13:26:15,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-18 13:26:15,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-18 13:26:15,091 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 105 [2018-11-18 13:26:15,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:26:15,091 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-18 13:26:15,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 13:26:15,092 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-18 13:26:15,092 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-18 13:26:15,095 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-18 13:26:15,131 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 13:26:15,145 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 13:26:15,162 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 13:26:15,171 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 13:26:15,175 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 13:26:15,305 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-18 13:26:15,305 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point gErr3ASSERT_VIOLATIONINTEGER_OVERFLOW(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point gFINAL(lines 10 16) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point gErr2ASSERT_VIOLATIONINTEGER_OVERFLOW(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point L15(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point L15-1(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L421 ceAbstractionStarter]: At program point L15-2(line 15) the Hoare annotation is: (and (or (and (<= 0 g_~x) (<= g_~x 2147483647) (not (= 0 g_~x))) (< |g_#in~x| 0) (< 2147483647 |g_#in~x|)) (not (= |g_#in~x| 0))) [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point L12(lines 12 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point L15-3(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point L15-4(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,306 INFO L425 ceAbstractionStarter]: For program point L15-5(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,307 INFO L421 ceAbstractionStarter]: At program point L15-6(line 15) the Hoare annotation is: (and (not (= |g_#in~x| 0)) (or (and (<= 0 g_~x) (= 1 |g_#t~ret0|) (<= g_~x 2147483647) (not (= 0 g_~x))) (< |g_#in~x| 0) (< 2147483647 |g_#in~x|))) [2018-11-18 13:26:15,307 INFO L425 ceAbstractionStarter]: For program point gEXIT(lines 10 16) no Hoare annotation was computed. [2018-11-18 13:26:15,307 INFO L425 ceAbstractionStarter]: For program point L15-7(line 15) no Hoare annotation was computed. [2018-11-18 13:26:15,307 INFO L428 ceAbstractionStarter]: At program point gENTRY(lines 10 16) the Hoare annotation is: true [2018-11-18 13:26:15,307 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-18 13:26:15,307 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-18 13:26:15,307 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-18 13:26:15,307 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-18 13:26:15,307 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 18 22) the Hoare annotation is: true [2018-11-18 13:26:15,307 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 18 22) no Hoare annotation was computed. [2018-11-18 13:26:15,307 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 18 22) no Hoare annotation was computed. [2018-11-18 13:26:15,307 INFO L421 ceAbstractionStarter]: At program point L21(line 21) the Hoare annotation is: (and (<= main_~x~0 2147483647) (<= 0 main_~x~0)) [2018-11-18 13:26:15,307 INFO L425 ceAbstractionStarter]: For program point L20(line 20) no Hoare annotation was computed. [2018-11-18 13:26:15,307 INFO L425 ceAbstractionStarter]: For program point L21-1(line 21) no Hoare annotation was computed. [2018-11-18 13:26:15,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 01:26:15 BoogieIcfgContainer [2018-11-18 13:26:15,310 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 13:26:15,310 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 13:26:15,310 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 13:26:15,310 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 13:26:15,311 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:26:00" (3/4) ... [2018-11-18 13:26:15,314 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-18 13:26:15,321 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-18 13:26:15,322 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure g [2018-11-18 13:26:15,322 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-18 13:26:15,325 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2018-11-18 13:26:15,325 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-11-18 13:26:15,325 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-18 13:26:15,348 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_3e4399f1-61da-49cd-8d93-76b3d07a7a53/bin-2019/utaipan/witness.graphml [2018-11-18 13:26:15,348 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 13:26:15,348 INFO L168 Benchmark]: Toolchain (without parser) took 15435.66 ms. Allocated memory was 1.0 GB in the beginning and 1.5 GB in the end (delta: 460.8 MB). Free memory was 953.8 MB in the beginning and 907.7 MB in the end (delta: 46.0 MB). Peak memory consumption was 506.9 MB. Max. memory is 11.5 GB. [2018-11-18 13:26:15,349 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 980.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 13:26:15,349 INFO L168 Benchmark]: CACSL2BoogieTranslator took 140.71 ms. Allocated memory is still 1.0 GB. Free memory was 953.8 MB in the beginning and 943.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-18 13:26:15,350 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.30 ms. Allocated memory is still 1.0 GB. Free memory is still 943.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 13:26:15,350 INFO L168 Benchmark]: Boogie Preprocessor took 10.19 ms. Allocated memory is still 1.0 GB. Free memory was 943.0 MB in the beginning and 940.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 13:26:15,350 INFO L168 Benchmark]: RCFGBuilder took 171.37 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 130.5 MB). Free memory was 940.3 MB in the beginning and 1.1 GB in the end (delta: -176.3 MB). Peak memory consumption was 19.8 MB. Max. memory is 11.5 GB. [2018-11-18 13:26:15,350 INFO L168 Benchmark]: TraceAbstraction took 15060.81 ms. Allocated memory was 1.2 GB in the beginning and 1.5 GB in the end (delta: 330.3 MB). Free memory was 1.1 GB in the beginning and 920.3 MB in the end (delta: 196.3 MB). Peak memory consumption was 526.6 MB. Max. memory is 11.5 GB. [2018-11-18 13:26:15,351 INFO L168 Benchmark]: Witness Printer took 37.97 ms. Allocated memory is still 1.5 GB. Free memory was 920.3 MB in the beginning and 907.7 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 11.5 GB. [2018-11-18 13:26:15,355 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 980.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 140.71 ms. Allocated memory is still 1.0 GB. Free memory was 953.8 MB in the beginning and 943.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.30 ms. Allocated memory is still 1.0 GB. Free memory is still 943.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.19 ms. Allocated memory is still 1.0 GB. Free memory was 943.0 MB in the beginning and 940.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 171.37 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 130.5 MB). Free memory was 940.3 MB in the beginning and 1.1 GB in the end (delta: -176.3 MB). Peak memory consumption was 19.8 MB. Max. memory is 11.5 GB. * TraceAbstraction took 15060.81 ms. Allocated memory was 1.2 GB in the beginning and 1.5 GB in the end (delta: 330.3 MB). Free memory was 1.1 GB in the beginning and 920.3 MB in the end (delta: 196.3 MB). Peak memory consumption was 526.6 MB. Max. memory is 11.5 GB. * Witness Printer took 37.97 ms. Allocated memory is still 1.5 GB. Free memory was 920.3 MB in the beginning and 907.7 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 15]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 15]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 15]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 15]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - AllSpecificationsHoldResult: All specifications hold 4 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 28 locations, 4 error locations. SAFE Result, 15.0s OverallTime, 27 OverallIterations, 18 TraceHistogramMax, 7.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.2s HoareAnnotationTime, HoareTripleCheckerStatistics: 591 SDtfs, 1890 SDslu, 3689 SDs, 0 SdLazy, 6136 SolverSat, 1111 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3137 GetRequests, 2063 SyntacticMatches, 6 SemanticMatches, 1068 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16448 ImplicationChecksByTransitivity, 9.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=323occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 27 MinimizatonAttempts, 67 StatesRemovedByMinimization, 11 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 230 PreInvPairs, 246 NumberOfFragments, 65 HoareAnnotationTreeSize, 230 FomulaSimplifications, 556 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 308 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 6.0s InterpolantComputationTime, 2421 NumberOfCodeBlocks, 2391 NumberOfCodeBlocksAsserted, 105 NumberOfCheckSat, 3459 ConstructedInterpolants, 0 QuantifiedInterpolants, 760380 SizeOfPredicates, 106 NumberOfNonLiveVariables, 2100 ConjunctsInSsa, 296 ConjunctsInUnsatCore, 63 InterpolantComputations, 13 PerfectInterpolantSequences, 6422/12226 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...