./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aa418289 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4039dcb878ce4fadab8efdd435e8ec3d803b5cc8 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-aa41828 [2018-11-23 06:48:09,269 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-23 06:48:09,270 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-23 06:48:09,277 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-23 06:48:09,278 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-23 06:48:09,278 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-23 06:48:09,279 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-23 06:48:09,280 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-23 06:48:09,281 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-23 06:48:09,282 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-23 06:48:09,282 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-23 06:48:09,283 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-23 06:48:09,283 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-23 06:48:09,284 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-23 06:48:09,285 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-23 06:48:09,285 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-23 06:48:09,286 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-23 06:48:09,287 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-23 06:48:09,288 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-23 06:48:09,289 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-23 06:48:09,290 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-23 06:48:09,291 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-23 06:48:09,293 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-23 06:48:09,293 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-23 06:48:09,293 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-23 06:48:09,294 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-23 06:48:09,295 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-23 06:48:09,295 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-23 06:48:09,296 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-23 06:48:09,296 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-23 06:48:09,297 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-23 06:48:09,298 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-23 06:48:09,298 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-23 06:48:09,298 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-23 06:48:09,298 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-23 06:48:09,299 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-23 06:48:09,299 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-23 06:48:09,309 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-23 06:48:09,309 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-23 06:48:09,310 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-23 06:48:09,310 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-23 06:48:09,310 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-23 06:48:09,310 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-23 06:48:09,310 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-23 06:48:09,310 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-23 06:48:09,310 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-23 06:48:09,311 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-23 06:48:09,311 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-23 06:48:09,311 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-23 06:48:09,311 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-23 06:48:09,311 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-23 06:48:09,312 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-23 06:48:09,312 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-23 06:48:09,312 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-23 06:48:09,312 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-23 06:48:09,312 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-23 06:48:09,312 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-23 06:48:09,312 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-23 06:48:09,312 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-23 06:48:09,313 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-23 06:48:09,313 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-23 06:48:09,313 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-23 06:48:09,315 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-23 06:48:09,315 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-23 06:48:09,315 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-23 06:48:09,316 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-23 06:48:09,316 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-23 06:48:09,316 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-23 06:48:09,316 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-23 06:48:09,316 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-23 06:48:09,316 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-23 06:48:09,316 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-23 06:48:09,316 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-23 06:48:09,317 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-23 06:48:09,317 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_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4039dcb878ce4fadab8efdd435e8ec3d803b5cc8 [2018-11-23 06:48:09,340 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-23 06:48:09,349 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-23 06:48:09,351 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-23 06:48:09,352 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-23 06:48:09,353 INFO L276 PluginConnector]: CDTParser initialized [2018-11-23 06:48:09,353 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c [2018-11-23 06:48:09,395 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/data/338790c1e/5ed5584e87c0479e9d2ac9c4a3fbbe3a/FLAGfa2dfe879 [2018-11-23 06:48:09,796 INFO L307 CDTParser]: Found 1 translation units. [2018-11-23 06:48:09,796 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/sv-benchmarks/c/recursive-simple/sum_25x0_true-unreach-call_true-termination.c [2018-11-23 06:48:09,800 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/data/338790c1e/5ed5584e87c0479e9d2ac9c4a3fbbe3a/FLAGfa2dfe879 [2018-11-23 06:48:09,811 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/data/338790c1e/5ed5584e87c0479e9d2ac9c4a3fbbe3a [2018-11-23 06:48:09,813 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-23 06:48:09,814 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-23 06:48:09,814 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-23 06:48:09,815 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-23 06:48:09,818 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-23 06:48:09,819 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,821 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4044db79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09, skipping insertion in model container [2018-11-23 06:48:09,821 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,829 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-23 06:48:09,844 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-23 06:48:09,955 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 06:48:09,958 INFO L191 MainTranslator]: Completed pre-run [2018-11-23 06:48:09,966 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 06:48:09,974 INFO L195 MainTranslator]: Completed translation [2018-11-23 06:48:09,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09 WrapperNode [2018-11-23 06:48:09,974 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-23 06:48:09,975 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-23 06:48:09,975 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-23 06:48:09,975 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-23 06:48:09,980 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,983 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,986 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-23 06:48:09,987 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-23 06:48:09,987 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-23 06:48:09,987 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-23 06:48:09,992 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,992 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,992 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,992 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,994 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,995 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,996 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... [2018-11-23 06:48:09,996 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-23 06:48:09,997 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-23 06:48:09,997 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-23 06:48:09,997 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-23 06:48:09,997 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:10,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-23 06:48:10,064 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-23 06:48:10,065 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-23 06:48:10,065 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-23 06:48:10,065 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-11-23 06:48:10,065 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-11-23 06:48:10,065 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-23 06:48:10,065 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-23 06:48:10,156 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-23 06:48:10,156 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-11-23 06:48:10,157 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 06:48:10 BoogieIcfgContainer [2018-11-23 06:48:10,157 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-23 06:48:10,157 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-23 06:48:10,158 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-23 06:48:10,160 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-23 06:48:10,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 06:48:09" (1/3) ... [2018-11-23 06:48:10,161 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a13eb98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 06:48:10, skipping insertion in model container [2018-11-23 06:48:10,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 06:48:09" (2/3) ... [2018-11-23 06:48:10,161 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a13eb98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 06:48:10, skipping insertion in model container [2018-11-23 06:48:10,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 06:48:10" (3/3) ... [2018-11-23 06:48:10,163 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_25x0_true-unreach-call_true-termination.c [2018-11-23 06:48:10,169 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-23 06:48:10,173 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-23 06:48:10,185 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-23 06:48:10,211 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-23 06:48:10,211 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-23 06:48:10,211 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-23 06:48:10,211 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-23 06:48:10,211 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-23 06:48:10,211 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-23 06:48:10,212 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-23 06:48:10,212 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-23 06:48:10,225 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-23 06:48:10,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-23 06:48:10,228 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:10,229 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:10,231 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:10,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:10,235 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2018-11-23 06:48:10,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:10,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:10,274 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:10,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:10,274 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:10,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:10,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-23 06:48:10,372 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-23 06:48:10,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-23 06:48:10,372 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 06:48:10,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-23 06:48:10,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-23 06:48:10,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-23 06:48:10,386 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-23 06:48:10,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:10,451 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-23 06:48:10,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-23 06:48:10,453 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-23 06:48:10,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:10,460 INFO L225 Difference]: With dead ends: 30 [2018-11-23 06:48:10,460 INFO L226 Difference]: Without dead ends: 18 [2018-11-23 06:48:10,462 INFO L631 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 [2018-11-23 06:48:10,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-23 06:48:10,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-23 06:48:10,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-23 06:48:10,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-23 06:48:10,493 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-23 06:48:10,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:10,493 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-23 06:48:10,493 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-23 06:48:10,494 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-23 06:48:10,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-23 06:48:10,495 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:10,495 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:10,495 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:10,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:10,496 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2018-11-23 06:48:10,496 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:10,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:10,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:10,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:10,497 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:10,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:10,559 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-23 06:48:10,559 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:10,559 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:10,560 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-11-23 06:48:10,562 INFO L202 CegarAbsIntRunner]: [0], [4], [7], [8], [10], [11], [12], [14], [17], [19], [25], [26], [27], [29], [30], [31], [32] [2018-11-23 06:48:10,588 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-23 06:48:10,589 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-23 06:48:10,698 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-23 06:48:10,699 INFO L272 AbstractInterpreter]: Visited 17 different actions 50 times. Never merged. Widened at 1 different actions 2 times. Performed 130 root evaluator evaluations with a maximum evaluation depth of 4. Performed 130 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 2 fixpoints after 2 different actions. Largest state had 6 variables. [2018-11-23 06:48:10,714 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:10,714 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-23 06:48:10,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:10,715 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:10,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:10,721 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:48:10,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:10,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:10,773 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-23 06:48:10,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:10,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-23 06:48:10,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:10,950 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-11-23 06:48:10,950 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:10,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-23 06:48:10,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-23 06:48:10,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-11-23 06:48:10,951 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-23 06:48:10,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:10,992 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-23 06:48:10,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-23 06:48:10,992 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-23 06:48:10,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:10,993 INFO L225 Difference]: With dead ends: 25 [2018-11-23 06:48:10,993 INFO L226 Difference]: Without dead ends: 21 [2018-11-23 06:48:10,994 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-11-23 06:48:10,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-23 06:48:10,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-23 06:48:10,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-23 06:48:10,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-23 06:48:10,998 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-23 06:48:10,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:10,998 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-23 06:48:10,998 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-23 06:48:10,999 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-23 06:48:10,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-23 06:48:10,999 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:10,999 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:11,000 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:11,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:11,000 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2018-11-23 06:48:11,000 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:11,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:11,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:11,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:11,001 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:11,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:11,056 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-23 06:48:11,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:11,056 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:11,056 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:11,056 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:11,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:11,057 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:11,063 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 06:48:11,063 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 06:48:11,077 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-23 06:48:11,077 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:11,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:11,085 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-23 06:48:11,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:11,283 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-23 06:48:11,306 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:11,306 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-11-23 06:48:11,306 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:11,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-23 06:48:11,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-23 06:48:11,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-11-23 06:48:11,308 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-11-23 06:48:11,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:11,364 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-23 06:48:11,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-23 06:48:11,364 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-11-23 06:48:11,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:11,365 INFO L225 Difference]: With dead ends: 28 [2018-11-23 06:48:11,365 INFO L226 Difference]: Without dead ends: 24 [2018-11-23 06:48:11,366 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-11-23 06:48:11,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-23 06:48:11,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-23 06:48:11,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-23 06:48:11,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-23 06:48:11,370 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-23 06:48:11,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:11,371 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-23 06:48:11,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-23 06:48:11,371 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-23 06:48:11,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-23 06:48:11,372 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:11,372 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:11,372 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:11,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:11,372 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2018-11-23 06:48:11,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:11,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:11,373 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:11,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:11,374 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:11,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:11,441 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 06:48:11,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:11,441 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:11,441 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:11,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:11,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:11,442 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:11,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 06:48:11,450 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 06:48:11,460 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 06:48:11,460 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:11,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:11,486 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 06:48:11,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:11,756 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-23 06:48:11,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:11,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-11-23 06:48:11,771 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:11,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-23 06:48:11,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-23 06:48:11,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-11-23 06:48:11,772 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-11-23 06:48:11,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:11,816 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-23 06:48:11,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-23 06:48:11,816 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-11-23 06:48:11,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:11,817 INFO L225 Difference]: With dead ends: 31 [2018-11-23 06:48:11,817 INFO L226 Difference]: Without dead ends: 27 [2018-11-23 06:48:11,817 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-23 06:48:11,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-23 06:48:11,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-23 06:48:11,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-23 06:48:11,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-23 06:48:11,821 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-23 06:48:11,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:11,822 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-23 06:48:11,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-23 06:48:11,822 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-23 06:48:11,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-23 06:48:11,823 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:11,823 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:11,823 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:11,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:11,823 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2018-11-23 06:48:11,823 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:11,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:11,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:11,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:11,824 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:11,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:11,889 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-23 06:48:11,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:11,889 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:11,890 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:11,890 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:11,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:11,890 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:11,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:11,899 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:48:11,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:11,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:11,921 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-23 06:48:11,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:12,321 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-23 06:48:12,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:12,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-11-23 06:48:12,335 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:12,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-23 06:48:12,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-23 06:48:12,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-11-23 06:48:12,336 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-23 06:48:12,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:12,381 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-23 06:48:12,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-23 06:48:12,382 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-11-23 06:48:12,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:12,382 INFO L225 Difference]: With dead ends: 34 [2018-11-23 06:48:12,382 INFO L226 Difference]: Without dead ends: 30 [2018-11-23 06:48:12,383 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-11-23 06:48:12,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-23 06:48:12,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-23 06:48:12,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-23 06:48:12,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-23 06:48:12,385 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-23 06:48:12,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:12,386 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-23 06:48:12,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-23 06:48:12,386 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-23 06:48:12,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-23 06:48:12,387 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:12,387 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:12,387 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:12,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:12,387 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2018-11-23 06:48:12,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:12,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:12,388 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:12,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:12,388 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:12,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:12,443 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-23 06:48:12,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:12,443 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:12,443 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:12,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:12,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:12,443 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:12,449 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 06:48:12,450 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 06:48:12,462 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-23 06:48:12,462 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:12,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:12,473 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-23 06:48:12,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:13,142 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 06:48:13,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:13,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-11-23 06:48:13,157 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:13,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-23 06:48:13,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-23 06:48:13,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-11-23 06:48:13,158 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-11-23 06:48:13,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:13,207 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-23 06:48:13,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-23 06:48:13,208 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-11-23 06:48:13,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:13,209 INFO L225 Difference]: With dead ends: 37 [2018-11-23 06:48:13,209 INFO L226 Difference]: Without dead ends: 33 [2018-11-23 06:48:13,209 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2018-11-23 06:48:13,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-23 06:48:13,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-23 06:48:13,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-23 06:48:13,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-23 06:48:13,213 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-23 06:48:13,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:13,213 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-23 06:48:13,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-23 06:48:13,213 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-23 06:48:13,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-23 06:48:13,214 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:13,214 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:13,214 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:13,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:13,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2018-11-23 06:48:13,215 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:13,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:13,215 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:13,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:13,215 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:13,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:13,279 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-23 06:48:13,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:13,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:13,280 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:13,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:13,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:13,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:13,290 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 06:48:13,290 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 06:48:13,304 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 06:48:13,304 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:13,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:13,333 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-23 06:48:13,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:14,102 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-23 06:48:14,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:14,117 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-11-23 06:48:14,117 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:14,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-23 06:48:14,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-23 06:48:14,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-11-23 06:48:14,118 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-11-23 06:48:14,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:14,182 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-23 06:48:14,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-23 06:48:14,183 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-11-23 06:48:14,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:14,183 INFO L225 Difference]: With dead ends: 40 [2018-11-23 06:48:14,183 INFO L226 Difference]: Without dead ends: 36 [2018-11-23 06:48:14,184 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 83 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2018-11-23 06:48:14,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-23 06:48:14,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-23 06:48:14,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-23 06:48:14,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-23 06:48:14,187 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-23 06:48:14,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:14,188 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-23 06:48:14,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-23 06:48:14,188 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-23 06:48:14,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-23 06:48:14,193 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:14,193 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:14,193 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:14,193 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:14,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2018-11-23 06:48:14,194 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:14,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:14,194 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:14,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:14,195 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:14,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:14,257 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-23 06:48:14,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:14,257 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:14,257 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:14,257 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:14,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:14,257 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:14,263 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:14,263 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:48:14,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:14,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:14,284 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-23 06:48:14,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:15,344 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-23 06:48:15,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:15,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-11-23 06:48:15,359 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:15,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-23 06:48:15,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-23 06:48:15,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-11-23 06:48:15,360 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-11-23 06:48:15,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:15,449 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-23 06:48:15,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-23 06:48:15,450 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-11-23 06:48:15,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:15,451 INFO L225 Difference]: With dead ends: 43 [2018-11-23 06:48:15,451 INFO L226 Difference]: Without dead ends: 39 [2018-11-23 06:48:15,451 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 93 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-11-23 06:48:15,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-23 06:48:15,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-23 06:48:15,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-23 06:48:15,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-23 06:48:15,455 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-23 06:48:15,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:15,455 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-23 06:48:15,455 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-23 06:48:15,455 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-23 06:48:15,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-23 06:48:15,456 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:15,456 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:15,456 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:15,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:15,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2018-11-23 06:48:15,457 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:15,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:15,457 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:15,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:15,457 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:15,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:15,538 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-23 06:48:15,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:15,539 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:15,539 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:15,539 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:15,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:15,539 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:15,548 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 06:48:15,548 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 06:48:15,568 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-23 06:48:15,569 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:15,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:15,583 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-23 06:48:15,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:17,040 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-23 06:48:17,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:17,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-11-23 06:48:17,056 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:17,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-23 06:48:17,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-23 06:48:17,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-11-23 06:48:17,057 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-11-23 06:48:17,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:17,140 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-23 06:48:17,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-23 06:48:17,140 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-23 06:48:17,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:17,141 INFO L225 Difference]: With dead ends: 46 [2018-11-23 06:48:17,141 INFO L226 Difference]: Without dead ends: 42 [2018-11-23 06:48:17,142 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 103 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2018-11-23 06:48:17,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-23 06:48:17,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-23 06:48:17,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-23 06:48:17,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-23 06:48:17,146 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-23 06:48:17,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:17,146 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-23 06:48:17,147 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-23 06:48:17,147 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-23 06:48:17,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-23 06:48:17,147 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:17,148 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:17,148 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:17,148 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:17,148 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2018-11-23 06:48:17,148 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:17,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:17,149 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:17,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:17,149 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:17,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:17,239 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-23 06:48:17,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:17,239 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:17,239 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:17,239 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:17,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:17,239 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:17,245 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 06:48:17,246 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 06:48:17,259 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 06:48:17,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:17,261 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:17,272 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-23 06:48:17,272 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:19,253 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-23 06:48:19,268 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:19,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-11-23 06:48:19,269 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:19,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-23 06:48:19,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-23 06:48:19,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-11-23 06:48:19,270 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-11-23 06:48:19,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:19,342 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-23 06:48:19,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-23 06:48:19,342 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-11-23 06:48:19,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:19,343 INFO L225 Difference]: With dead ends: 49 [2018-11-23 06:48:19,343 INFO L226 Difference]: Without dead ends: 45 [2018-11-23 06:48:19,344 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2018-11-23 06:48:19,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-23 06:48:19,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-23 06:48:19,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-23 06:48:19,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-23 06:48:19,348 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-23 06:48:19,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:19,348 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-23 06:48:19,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-23 06:48:19,348 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-23 06:48:19,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-23 06:48:19,350 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:19,350 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:19,350 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:19,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:19,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2018-11-23 06:48:19,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:19,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:19,351 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:19,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:19,351 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:19,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:19,445 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-23 06:48:19,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:19,445 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:19,445 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:19,445 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:19,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:19,445 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:19,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:19,451 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:48:19,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:19,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:19,480 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-23 06:48:19,480 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:21,973 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-23 06:48:21,987 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:21,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-11-23 06:48:21,987 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:21,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-23 06:48:21,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-23 06:48:21,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-11-23 06:48:21,988 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-11-23 06:48:22,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:22,082 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-11-23 06:48:22,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-23 06:48:22,082 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-11-23 06:48:22,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:22,083 INFO L225 Difference]: With dead ends: 52 [2018-11-23 06:48:22,083 INFO L226 Difference]: Without dead ends: 48 [2018-11-23 06:48:22,084 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2018-11-23 06:48:22,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-23 06:48:22,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-23 06:48:22,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-23 06:48:22,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-23 06:48:22,087 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-11-23 06:48:22,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:22,087 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-23 06:48:22,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-23 06:48:22,087 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-23 06:48:22,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-23 06:48:22,088 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:22,088 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:22,088 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:22,088 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:22,089 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2018-11-23 06:48:22,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:22,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:22,089 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:22,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:22,089 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:22,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:22,218 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-23 06:48:22,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:22,218 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:22,218 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:22,218 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:22,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:22,218 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:22,225 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 06:48:22,225 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 06:48:22,265 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-23 06:48:22,265 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:22,267 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:22,276 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-23 06:48:22,276 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:25,468 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-23 06:48:25,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:25,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-11-23 06:48:25,482 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:25,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-23 06:48:25,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-23 06:48:25,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-11-23 06:48:25,483 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-11-23 06:48:25,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:25,600 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-11-23 06:48:25,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-23 06:48:25,600 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-11-23 06:48:25,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:25,601 INFO L225 Difference]: With dead ends: 55 [2018-11-23 06:48:25,601 INFO L226 Difference]: Without dead ends: 51 [2018-11-23 06:48:25,602 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2018-11-23 06:48:25,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-23 06:48:25,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-11-23 06:48:25,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-23 06:48:25,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-23 06:48:25,605 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-11-23 06:48:25,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:25,605 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-23 06:48:25,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-23 06:48:25,605 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-23 06:48:25,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-23 06:48:25,606 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:25,606 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:25,606 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:25,606 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:25,607 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2018-11-23 06:48:25,607 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:25,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:25,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:25,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:25,607 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:25,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:25,721 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-23 06:48:25,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:25,721 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:25,721 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:25,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:25,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:25,721 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:25,733 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 06:48:25,733 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 06:48:25,765 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 06:48:25,765 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:25,768 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:25,784 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-23 06:48:25,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:29,904 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-11-23 06:48:29,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:29,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-11-23 06:48:29,919 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:29,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-23 06:48:29,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-23 06:48:29,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-11-23 06:48:29,920 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-11-23 06:48:30,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:30,033 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-11-23 06:48:30,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-23 06:48:30,033 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-11-23 06:48:30,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:30,034 INFO L225 Difference]: With dead ends: 58 [2018-11-23 06:48:30,034 INFO L226 Difference]: Without dead ends: 54 [2018-11-23 06:48:30,034 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-11-23 06:48:30,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-23 06:48:30,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-11-23 06:48:30,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-23 06:48:30,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-23 06:48:30,037 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-11-23 06:48:30,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:30,037 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-23 06:48:30,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-23 06:48:30,038 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-23 06:48:30,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-23 06:48:30,038 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:30,038 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:30,039 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:30,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:30,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2018-11-23 06:48:30,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:30,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:30,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:30,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:30,040 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:30,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:30,137 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-23 06:48:30,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:30,138 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:30,138 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:30,138 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:30,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:30,138 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:30,144 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:30,144 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:48:30,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:30,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:30,175 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-23 06:48:30,175 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:35,276 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-23 06:48:35,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:35,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-11-23 06:48:35,291 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:35,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-23 06:48:35,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-23 06:48:35,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-11-23 06:48:35,291 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-11-23 06:48:35,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:35,413 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-11-23 06:48:35,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-23 06:48:35,413 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-11-23 06:48:35,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:35,414 INFO L225 Difference]: With dead ends: 61 [2018-11-23 06:48:35,414 INFO L226 Difference]: Without dead ends: 57 [2018-11-23 06:48:35,414 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 153 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2018-11-23 06:48:35,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-23 06:48:35,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-23 06:48:35,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-23 06:48:35,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-23 06:48:35,417 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-11-23 06:48:35,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:35,418 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-23 06:48:35,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-23 06:48:35,418 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-23 06:48:35,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-23 06:48:35,419 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:35,419 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:35,419 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:35,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:35,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2018-11-23 06:48:35,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:35,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:35,420 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:35,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:35,420 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:35,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:35,568 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-23 06:48:35,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:35,569 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:35,569 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:35,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:35,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:35,569 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:35,586 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 06:48:35,586 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 06:48:35,635 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-23 06:48:35,635 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:35,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:35,648 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-23 06:48:35,648 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:41,827 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-11-23 06:48:41,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:41,843 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 35 [2018-11-23 06:48:41,843 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:41,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-23 06:48:41,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-23 06:48:41,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2018-11-23 06:48:41,844 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-11-23 06:48:42,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:42,003 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-11-23 06:48:42,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-23 06:48:42,004 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-11-23 06:48:42,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:42,004 INFO L225 Difference]: With dead ends: 64 [2018-11-23 06:48:42,005 INFO L226 Difference]: Without dead ends: 60 [2018-11-23 06:48:42,005 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 30 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=803, Invalid=1647, Unknown=0, NotChecked=0, Total=2450 [2018-11-23 06:48:42,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-23 06:48:42,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-23 06:48:42,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-23 06:48:42,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-23 06:48:42,009 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-11-23 06:48:42,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:42,009 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-23 06:48:42,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-23 06:48:42,009 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-23 06:48:42,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-23 06:48:42,010 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:42,010 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:42,010 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:42,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:42,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2018-11-23 06:48:42,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:42,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:42,011 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:42,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:42,011 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:42,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:42,159 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-23 06:48:42,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:42,159 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:42,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:42,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:42,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:42,159 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:42,166 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 06:48:42,166 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 06:48:42,185 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 06:48:42,185 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:42,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:42,198 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-23 06:48:42,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:49,605 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-23 06:48:49,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:49,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 37 [2018-11-23 06:48:49,619 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:49,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-23 06:48:49,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-23 06:48:49,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2018-11-23 06:48:49,620 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-11-23 06:48:49,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:49,790 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-11-23 06:48:49,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-23 06:48:49,790 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-11-23 06:48:49,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:49,791 INFO L225 Difference]: With dead ends: 67 [2018-11-23 06:48:49,791 INFO L226 Difference]: Without dead ends: 63 [2018-11-23 06:48:49,791 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 173 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=904, Invalid=1852, Unknown=0, NotChecked=0, Total=2756 [2018-11-23 06:48:49,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-23 06:48:49,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-11-23 06:48:49,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-23 06:48:49,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-11-23 06:48:49,794 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-11-23 06:48:49,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:49,795 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-11-23 06:48:49,795 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-23 06:48:49,795 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-11-23 06:48:49,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-23 06:48:49,796 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:49,796 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:49,796 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:49,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:49,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1066046876, now seen corresponding path program 16 times [2018-11-23 06:48:49,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:49,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:49,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:48:49,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:49,801 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:49,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:49,965 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-23 06:48:49,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:49,965 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:49,965 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:49,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:49,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:49,965 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:49,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:49,971 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:48:49,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:49,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:50,025 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-23 06:48:50,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:48:58,971 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-11-23 06:48:58,986 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:48:58,986 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 37] total 39 [2018-11-23 06:48:58,986 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:48:58,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-23 06:48:58,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-23 06:48:58,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2018-11-23 06:48:58,987 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-11-23 06:48:59,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:48:59,154 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-11-23 06:48:59,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-23 06:48:59,154 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-11-23 06:48:59,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:48:59,155 INFO L225 Difference]: With dead ends: 70 [2018-11-23 06:48:59,155 INFO L226 Difference]: Without dead ends: 66 [2018-11-23 06:48:59,156 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 183 SyntacticMatches, 34 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1011, Invalid=2069, Unknown=0, NotChecked=0, Total=3080 [2018-11-23 06:48:59,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-23 06:48:59,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-11-23 06:48:59,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-23 06:48:59,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-11-23 06:48:59,159 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-11-23 06:48:59,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:48:59,160 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-11-23 06:48:59,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-23 06:48:59,160 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-11-23 06:48:59,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-11-23 06:48:59,160 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:48:59,160 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:48:59,160 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:48:59,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:48:59,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1300351236, now seen corresponding path program 17 times [2018-11-23 06:48:59,161 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:48:59,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:59,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:48:59,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:48:59,161 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:48:59,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:48:59,354 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-23 06:48:59,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:59,355 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:48:59,355 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:48:59,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:48:59,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:48:59,355 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:48:59,361 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 06:48:59,361 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 06:48:59,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-23 06:48:59,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:48:59,398 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:48:59,413 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-23 06:48:59,413 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:49:10,142 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-23 06:49:10,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:49:10,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2018-11-23 06:49:10,156 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:49:10,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-23 06:49:10,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-23 06:49:10,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2018-11-23 06:49:10,157 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-11-23 06:49:10,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:49:10,307 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-11-23 06:49:10,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-23 06:49:10,307 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-11-23 06:49:10,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:49:10,308 INFO L225 Difference]: With dead ends: 73 [2018-11-23 06:49:10,308 INFO L226 Difference]: Without dead ends: 69 [2018-11-23 06:49:10,309 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 193 SyntacticMatches, 36 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2018-11-23 06:49:10,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-23 06:49:10,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-23 06:49:10,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-23 06:49:10,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-11-23 06:49:10,312 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-11-23 06:49:10,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:49:10,312 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-11-23 06:49:10,312 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-23 06:49:10,312 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-11-23 06:49:10,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-11-23 06:49:10,313 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:49:10,313 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:49:10,313 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:49:10,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:49:10,313 INFO L82 PathProgramCache]: Analyzing trace with hash 227065820, now seen corresponding path program 18 times [2018-11-23 06:49:10,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:49:10,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:49:10,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:49:10,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:49:10,314 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:49:10,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:49:10,491 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-23 06:49:10,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:49:10,491 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:49:10,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:49:10,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:49:10,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:49:10,492 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/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 [2018-11-23 06:49:10,498 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 06:49:10,498 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 06:49:10,520 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 06:49:10,520 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:49:10,523 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:49:10,537 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-23 06:49:10,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:49:23,260 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2018-11-23 06:49:23,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:49:23,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2018-11-23 06:49:23,275 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:49:23,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-23 06:49:23,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-23 06:49:23,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2018-11-23 06:49:23,276 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-11-23 06:49:23,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:49:23,476 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-11-23 06:49:23,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-23 06:49:23,477 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-11-23 06:49:23,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:49:23,477 INFO L225 Difference]: With dead ends: 76 [2018-11-23 06:49:23,477 INFO L226 Difference]: Without dead ends: 72 [2018-11-23 06:49:23,478 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 203 SyntacticMatches, 38 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2018-11-23 06:49:23,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-23 06:49:23,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-11-23 06:49:23,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-23 06:49:23,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-11-23 06:49:23,481 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-11-23 06:49:23,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:49:23,481 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-11-23 06:49:23,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-23 06:49:23,481 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-11-23 06:49:23,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-11-23 06:49:23,482 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:49:23,482 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:49:23,482 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:49:23,482 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:49:23,483 INFO L82 PathProgramCache]: Analyzing trace with hash -479687356, now seen corresponding path program 19 times [2018-11-23 06:49:23,483 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:49:23,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:49:23,483 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:49:23,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:49:23,483 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:49:23,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:49:23,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-23 06:49:23,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:49:23,664 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:49:23,664 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:49:23,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:49:23,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:49:23,664 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 06:49:23,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:49:23,670 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:49:23,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:49:23,695 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:49:23,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-23 06:49:23,709 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:49:38,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-23 06:49:38,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:49:38,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 45 [2018-11-23 06:49:38,844 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:49:38,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-23 06:49:38,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-23 06:49:38,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=1472, Unknown=0, NotChecked=0, Total=1980 [2018-11-23 06:49:38,845 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-11-23 06:49:39,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:49:39,028 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-11-23 06:49:39,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-23 06:49:39,028 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-11-23 06:49:39,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:49:39,029 INFO L225 Difference]: With dead ends: 79 [2018-11-23 06:49:39,029 INFO L226 Difference]: Without dead ends: 75 [2018-11-23 06:49:39,030 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 213 SyntacticMatches, 40 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1368, Invalid=2792, Unknown=0, NotChecked=0, Total=4160 [2018-11-23 06:49:39,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-23 06:49:39,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-11-23 06:49:39,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-23 06:49:39,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-11-23 06:49:39,032 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-11-23 06:49:39,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:49:39,032 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-11-23 06:49:39,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-23 06:49:39,032 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-11-23 06:49:39,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-11-23 06:49:39,033 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:49:39,033 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:49:39,033 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:49:39,033 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:49:39,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1598174692, now seen corresponding path program 20 times [2018-11-23 06:49:39,033 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:49:39,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:49:39,033 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:49:39,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:49:39,034 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:49:39,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:49:39,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-11-23 06:49:39,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:49:39,230 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:49:39,230 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:49:39,230 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:49:39,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:49:39,230 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 06:49:39,237 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 06:49:39,237 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 06:49:39,274 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-23 06:49:39,274 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:49:39,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:49:39,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-11-23 06:49:39,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:49:56,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 1010 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-23 06:49:56,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:49:56,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 45] total 47 [2018-11-23 06:49:56,804 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:49:56,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-23 06:49:56,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-23 06:49:56,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=554, Invalid=1608, Unknown=0, NotChecked=0, Total=2162 [2018-11-23 06:49:56,805 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 25 states. [2018-11-23 06:49:57,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:49:57,033 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2018-11-23 06:49:57,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-23 06:49:57,033 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 133 [2018-11-23 06:49:57,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:49:57,034 INFO L225 Difference]: With dead ends: 82 [2018-11-23 06:49:57,034 INFO L226 Difference]: Without dead ends: 78 [2018-11-23 06:49:57,035 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 223 SyntacticMatches, 42 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1302 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1499, Invalid=3057, Unknown=0, NotChecked=0, Total=4556 [2018-11-23 06:49:57,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-23 06:49:57,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-11-23 06:49:57,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-11-23 06:49:57,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-11-23 06:49:57,039 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 133 [2018-11-23 06:49:57,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:49:57,039 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-11-23 06:49:57,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-23 06:49:57,039 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-11-23 06:49:57,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-11-23 06:49:57,040 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:49:57,040 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:49:57,040 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:49:57,040 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:49:57,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1648275844, now seen corresponding path program 21 times [2018-11-23 06:49:57,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:49:57,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:49:57,041 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:49:57,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:49:57,041 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:49:57,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:49:57,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-11-23 06:49:57,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:49:57,240 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:49:57,241 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:49:57,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:49:57,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:49:57,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 06:49:57,250 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 06:49:57,250 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 06:49:57,274 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 06:49:57,274 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:49:57,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:49:57,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-11-23 06:49:57,296 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:50:17,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-23 06:50:17,559 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:50:17,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 47] total 49 [2018-11-23 06:50:17,559 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:50:17,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-23 06:50:17,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-23 06:50:17,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=1750, Unknown=0, NotChecked=0, Total=2352 [2018-11-23 06:50:17,560 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 26 states. [2018-11-23 06:50:17,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:50:17,810 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-11-23 06:50:17,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-23 06:50:17,810 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 139 [2018-11-23 06:50:17,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:50:17,811 INFO L225 Difference]: With dead ends: 85 [2018-11-23 06:50:17,811 INFO L226 Difference]: Without dead ends: 81 [2018-11-23 06:50:17,812 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 233 SyntacticMatches, 44 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1636, Invalid=3334, Unknown=0, NotChecked=0, Total=4970 [2018-11-23 06:50:17,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-23 06:50:17,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-11-23 06:50:17,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-11-23 06:50:17,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-11-23 06:50:17,814 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 139 [2018-11-23 06:50:17,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:50:17,814 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-11-23 06:50:17,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-23 06:50:17,814 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-11-23 06:50:17,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-11-23 06:50:17,815 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:50:17,815 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:50:17,815 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:50:17,815 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:50:17,815 INFO L82 PathProgramCache]: Analyzing trace with hash -1314278308, now seen corresponding path program 22 times [2018-11-23 06:50:17,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:50:17,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:50:17,815 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:50:17,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:50:17,816 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:50:17,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:50:18,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-11-23 06:50:18,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:50:18,076 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:50:18,076 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:50:18,076 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:50:18,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:50:18,076 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 06:50:18,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:50:18,086 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:50:18,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:50:18,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:50:18,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-11-23 06:50:18,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:50:41,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 1221 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2018-11-23 06:50:41,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:50:41,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 49] total 51 [2018-11-23 06:50:41,574 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:50:41,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-23 06:50:41,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-23 06:50:41,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=1898, Unknown=0, NotChecked=0, Total=2550 [2018-11-23 06:50:41,575 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 27 states. [2018-11-23 06:50:41,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:50:41,828 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2018-11-23 06:50:41,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-23 06:50:41,828 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2018-11-23 06:50:41,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:50:41,828 INFO L225 Difference]: With dead ends: 88 [2018-11-23 06:50:41,828 INFO L226 Difference]: Without dead ends: 84 [2018-11-23 06:50:41,829 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 243 SyntacticMatches, 46 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1779, Invalid=3623, Unknown=0, NotChecked=0, Total=5402 [2018-11-23 06:50:41,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-11-23 06:50:41,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-11-23 06:50:41,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-11-23 06:50:41,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-11-23 06:50:41,832 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 145 [2018-11-23 06:50:41,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:50:41,832 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-11-23 06:50:41,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-23 06:50:41,832 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-11-23 06:50:41,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-11-23 06:50:41,832 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:50:41,832 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:50:41,833 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:50:41,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:50:41,833 INFO L82 PathProgramCache]: Analyzing trace with hash 2015638980, now seen corresponding path program 23 times [2018-11-23 06:50:41,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:50:41,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:50:41,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:50:41,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:50:41,834 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:50:41,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:50:42,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-11-23 06:50:42,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:50:42,043 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:50:42,043 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:50:42,043 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:50:42,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:50:42,043 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 06:50:42,050 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 06:50:42,050 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 06:50:42,092 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-23 06:50:42,092 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:50:42,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:50:42,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-11-23 06:50:42,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:51:08,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-23 06:51:08,941 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:51:08,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 51] total 53 [2018-11-23 06:51:08,941 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:51:08,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-23 06:51:08,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-23 06:51:08,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=2052, Unknown=0, NotChecked=0, Total=2756 [2018-11-23 06:51:08,942 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 28 states. [2018-11-23 06:51:09,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:51:09,191 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-11-23 06:51:09,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-23 06:51:09,191 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 151 [2018-11-23 06:51:09,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:51:09,192 INFO L225 Difference]: With dead ends: 91 [2018-11-23 06:51:09,192 INFO L226 Difference]: Without dead ends: 87 [2018-11-23 06:51:09,193 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 253 SyntacticMatches, 48 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1704 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1928, Invalid=3924, Unknown=0, NotChecked=0, Total=5852 [2018-11-23 06:51:09,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-23 06:51:09,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-11-23 06:51:09,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-23 06:51:09,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-11-23 06:51:09,196 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 151 [2018-11-23 06:51:09,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:51:09,196 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-11-23 06:51:09,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-23 06:51:09,196 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-11-23 06:51:09,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-11-23 06:51:09,197 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:51:09,197 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:51:09,197 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:51:09,197 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:51:09,197 INFO L82 PathProgramCache]: Analyzing trace with hash 483163804, now seen corresponding path program 24 times [2018-11-23 06:51:09,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:51:09,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:51:09,198 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:51:09,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:51:09,198 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:51:09,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:51:09,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-11-23 06:51:09,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:51:09,478 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:51:09,478 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:51:09,478 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:51:09,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:51:09,478 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 06:51:09,485 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 06:51:09,485 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 06:51:09,513 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 06:51:09,513 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 06:51:09,516 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:51:09,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-11-23 06:51:09,549 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:51:40,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 1452 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2018-11-23 06:51:40,325 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:51:40,325 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 53] total 54 [2018-11-23 06:51:40,325 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:51:40,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-23 06:51:40,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-23 06:51:40,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862 [2018-11-23 06:51:40,326 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 29 states. [2018-11-23 06:51:40,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:51:40,605 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2018-11-23 06:51:40,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-23 06:51:40,605 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 157 [2018-11-23 06:51:40,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:51:40,606 INFO L225 Difference]: With dead ends: 94 [2018-11-23 06:51:40,606 INFO L226 Difference]: Without dead ends: 90 [2018-11-23 06:51:40,607 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 263 SyntacticMatches, 51 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1776 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=2080, Invalid=4082, Unknown=0, NotChecked=0, Total=6162 [2018-11-23 06:51:40,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-23 06:51:40,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-11-23 06:51:40,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-23 06:51:40,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-11-23 06:51:40,609 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 157 [2018-11-23 06:51:40,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:51:40,610 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-11-23 06:51:40,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-23 06:51:40,610 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-11-23 06:51:40,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-11-23 06:51:40,610 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 06:51:40,610 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 06:51:40,611 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 06:51:40,611 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 06:51:40,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1060706820, now seen corresponding path program 25 times [2018-11-23 06:51:40,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 06:51:40,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:51:40,612 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 06:51:40,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 06:51:40,612 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 06:51:40,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:51:41,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 999 refuted. 0 times theorem prover too weak. 901 trivial. 0 not checked. [2018-11-23 06:51:41,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:51:41,919 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 06:51:41,919 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 06:51:41,919 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 06:51:41,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 06:51:41,919 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 06:51:41,925 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 06:51:41,925 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 06:51:41,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 06:51:41,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 06:51:44,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 949 proven. 50 refuted. 0 times theorem prover too weak. 901 trivial. 0 not checked. [2018-11-23 06:51:44,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 06:51:48,731 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2018-11-23 06:51:49,028 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-11-23 06:51:49,139 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2018-11-23 06:51:49,340 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-11-23 06:51:49,446 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-11-23 06:51:49,563 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 141 [2018-11-23 06:51:49,775 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-11-23 06:51:49,891 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-11-23 06:51:53,952 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-11-23 06:51:54,157 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2018-11-23 06:51:54,362 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-11-23 06:51:54,466 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2018-11-23 06:51:58,556 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2018-11-23 06:52:31,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 900 proven. 675 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-23 06:52:31,741 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 06:52:31,741 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 83] total 193 [2018-11-23 06:52:31,741 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 06:52:31,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-11-23 06:52:31,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-11-23 06:52:31,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4821, Invalid=32235, Unknown=0, NotChecked=0, Total=37056 [2018-11-23 06:52:31,745 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 116 states. [2018-11-23 06:52:35,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 06:52:35,568 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-11-23 06:52:35,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-11-23 06:52:35,568 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 163 [2018-11-23 06:52:35,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 06:52:35,568 INFO L225 Difference]: With dead ends: 93 [2018-11-23 06:52:35,568 INFO L226 Difference]: Without dead ends: 0 [2018-11-23 06:52:35,571 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 213 SyntacticMatches, 4 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11061 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=8862, Invalid=51900, Unknown=0, NotChecked=0, Total=60762 [2018-11-23 06:52:35,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-23 06:52:35,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-23 06:52:35,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-23 06:52:35,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-23 06:52:35,571 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 163 [2018-11-23 06:52:35,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 06:52:35,571 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-23 06:52:35,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-11-23 06:52:35,571 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-23 06:52:35,571 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-23 06:52:35,574 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-23 06:52:35,600 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-23 06:52:35,600 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-23 06:52:35,600 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-23 06:52:35,601 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-23 06:52:35,601 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-23 06:52:35,601 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-23 06:52:35,601 INFO L448 ceAbstractionStarter]: For program point sumEXIT(lines 3 9) no Hoare annotation was computed. [2018-11-23 06:52:35,601 INFO L444 ceAbstractionStarter]: At program point L7(line 7) the Hoare annotation is: (and (= sum_~m |sum_#in~m|) (= sum_~n |sum_#in~n|) (< 0 sum_~n)) [2018-11-23 06:52:35,601 INFO L448 ceAbstractionStarter]: For program point L7-1(line 7) no Hoare annotation was computed. [2018-11-23 06:52:35,601 INFO L448 ceAbstractionStarter]: For program point L4(lines 4 8) no Hoare annotation was computed. [2018-11-23 06:52:35,601 INFO L448 ceAbstractionStarter]: For program point sumFINAL(lines 3 9) no Hoare annotation was computed. [2018-11-23 06:52:35,601 INFO L451 ceAbstractionStarter]: At program point sumENTRY(lines 3 9) the Hoare annotation is: true [2018-11-23 06:52:35,601 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 11 18) the Hoare annotation is: true [2018-11-23 06:52:35,601 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 11 18) no Hoare annotation was computed. [2018-11-23 06:52:35,601 INFO L448 ceAbstractionStarter]: For program point L16(line 16) no Hoare annotation was computed. [2018-11-23 06:52:35,601 INFO L448 ceAbstractionStarter]: For program point L15(lines 15 17) no Hoare annotation was computed. [2018-11-23 06:52:35,602 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2018-11-23 06:52:35,602 INFO L444 ceAbstractionStarter]: At program point L14(line 14) the Hoare annotation is: (and (<= main_~a~0 25) (<= 25 main_~a~0)) [2018-11-23 06:52:35,602 INFO L448 ceAbstractionStarter]: For program point L14-1(line 14) no Hoare annotation was computed. [2018-11-23 06:52:35,602 INFO L448 ceAbstractionStarter]: For program point L15-2(lines 11 18) no Hoare annotation was computed. [2018-11-23 06:52:35,604 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 06:52:35 BoogieIcfgContainer [2018-11-23 06:52:35,604 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-23 06:52:35,604 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-23 06:52:35,604 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-23 06:52:35,604 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-23 06:52:35,605 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 06:48:10" (3/4) ... [2018-11-23 06:52:35,609 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-23 06:52:35,613 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-23 06:52:35,613 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure sum [2018-11-23 06:52:35,614 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-23 06:52:35,616 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-23 06:52:35,616 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2018-11-23 06:52:35,617 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-23 06:52:35,641 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_5a40476b-0410-400e-afa3-26933f05cc1a/bin-2019/utaipan/witness.graphml [2018-11-23 06:52:35,642 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-23 06:52:35,642 INFO L168 Benchmark]: Toolchain (without parser) took 265828.84 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 260.6 MB). Free memory was 958.2 MB in the beginning and 872.4 MB in the end (delta: 85.8 MB). Peak memory consumption was 346.3 MB. Max. memory is 11.5 GB. [2018-11-23 06:52:35,643 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 985.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 06:52:35,643 INFO L168 Benchmark]: CACSL2BoogieTranslator took 160.02 ms. Allocated memory is still 1.0 GB. Free memory was 958.2 MB in the beginning and 947.4 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-23 06:52:35,643 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.73 ms. Allocated memory is still 1.0 GB. Free memory is still 947.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 06:52:35,643 INFO L168 Benchmark]: Boogie Preprocessor took 9.98 ms. Allocated memory is still 1.0 GB. Free memory was 947.4 MB in the beginning and 944.7 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-23 06:52:35,644 INFO L168 Benchmark]: RCFGBuilder took 160.18 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 134.2 MB). Free memory was 944.7 MB in the beginning and 1.1 GB in the end (delta: -178.0 MB). Peak memory consumption was 14.4 MB. Max. memory is 11.5 GB. [2018-11-23 06:52:35,644 INFO L168 Benchmark]: TraceAbstraction took 265446.56 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 126.4 MB). Free memory was 1.1 GB in the beginning and 872.4 MB in the end (delta: 247.6 MB). Peak memory consumption was 374.0 MB. Max. memory is 11.5 GB. [2018-11-23 06:52:35,644 INFO L168 Benchmark]: Witness Printer took 37.30 ms. Allocated memory is still 1.3 GB. Free memory was 872.4 MB in the beginning and 872.4 MB in the end (delta: 2.1 kB). Peak memory consumption was 2.1 kB. Max. memory is 11.5 GB. [2018-11-23 06:52:35,646 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 985.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 160.02 ms. Allocated memory is still 1.0 GB. Free memory was 958.2 MB in the beginning and 947.4 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 11.73 ms. Allocated memory is still 1.0 GB. Free memory is still 947.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 9.98 ms. Allocated memory is still 1.0 GB. Free memory was 947.4 MB in the beginning and 944.7 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 160.18 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 134.2 MB). Free memory was 944.7 MB in the beginning and 1.1 GB in the end (delta: -178.0 MB). Peak memory consumption was 14.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 265446.56 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 126.4 MB). Free memory was 1.1 GB in the beginning and 872.4 MB in the end (delta: 247.6 MB). Peak memory consumption was 374.0 MB. Max. memory is 11.5 GB. * Witness Printer took 37.30 ms. Allocated memory is still 1.3 GB. Free memory was 872.4 MB in the beginning and 872.4 MB in the end (delta: 2.1 kB). Peak memory consumption was 2.1 kB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 265.4s OverallTime, 26 OverallIterations, 26 TraceHistogramMax, 7.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 337 SDtfs, 916 SDslu, 4588 SDs, 0 SdLazy, 5579 SolverSat, 326 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5712 GetRequests, 3767 SyntacticMatches, 653 SemanticMatches, 1292 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27235 ImplicationChecksByTransitivity, 24.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=90occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 22 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 3 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 256.1s InterpolantComputationTime, 4563 NumberOfCodeBlocks, 4563 NumberOfCodeBlocksAsserted, 159 NumberOfCheckSat, 6762 ConstructedInterpolants, 0 QuantifiedInterpolants, 2869632 SizeOfPredicates, 404 NumberOfNonLiveVariables, 6750 ConjunctsInSsa, 963 ConjunctsInUnsatCore, 76 InterpolantComputations, 1 PerfectInterpolantSequences, 21576/50700 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...