./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loop-acceleration/underapprox_false-unreach-call1_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_false-unreach-call1_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/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 0d29117e01c2d68b456be2ae55b4c10d8b73c290 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-5842f4b [2018-11-18 09:41:33,233 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 09:41:33,234 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 09:41:33,239 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 09:41:33,239 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 09:41:33,240 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 09:41:33,241 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 09:41:33,242 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 09:41:33,243 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 09:41:33,244 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 09:41:33,244 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 09:41:33,244 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 09:41:33,245 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 09:41:33,245 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 09:41:33,246 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 09:41:33,246 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 09:41:33,247 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 09:41:33,248 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 09:41:33,249 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 09:41:33,250 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 09:41:33,251 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 09:41:33,252 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 09:41:33,253 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 09:41:33,253 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 09:41:33,253 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 09:41:33,254 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 09:41:33,254 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 09:41:33,255 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 09:41:33,255 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 09:41:33,256 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 09:41:33,256 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 09:41:33,256 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 09:41:33,256 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 09:41:33,256 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 09:41:33,257 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 09:41:33,257 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 09:41:33,257 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-18 09:41:33,264 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 09:41:33,265 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 09:41:33,265 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 09:41:33,265 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-18 09:41:33,266 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-18 09:41:33,266 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-18 09:41:33,266 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-18 09:41:33,266 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-18 09:41:33,266 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-18 09:41:33,266 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-18 09:41:33,266 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-18 09:41:33,267 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-18 09:41:33,267 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-18 09:41:33,267 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 09:41:33,267 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 09:41:33,267 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 09:41:33,268 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 09:41:33,268 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 09:41:33,268 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 09:41:33,268 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 09:41:33,268 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 09:41:33,268 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 09:41:33,268 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 09:41:33,269 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 09:41:33,269 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 09:41:33,269 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 09:41:33,269 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 09:41:33,269 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 09:41:33,269 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 09:41:33,270 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 09:41:33,270 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 09:41:33,270 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 09:41:33,270 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 09:41:33,270 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-18 09:41:33,270 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 09:41:33,270 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 09:41:33,271 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-18 09:41:33,271 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_a3c6f0c4-9400-4059-85ca-e246aabe8f94/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 -> 0d29117e01c2d68b456be2ae55b4c10d8b73c290 [2018-11-18 09:41:33,296 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 09:41:33,305 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 09:41:33,308 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 09:41:33,309 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 09:41:33,309 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 09:41:33,310 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/../../sv-benchmarks/c/loop-acceleration/underapprox_false-unreach-call1_true-termination.i [2018-11-18 09:41:33,350 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/data/91ce7a501/f59a25cbfcdb4d7089f66df61ba6259e/FLAGaba54051f [2018-11-18 09:41:33,738 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 09:41:33,738 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/sv-benchmarks/c/loop-acceleration/underapprox_false-unreach-call1_true-termination.i [2018-11-18 09:41:33,742 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/data/91ce7a501/f59a25cbfcdb4d7089f66df61ba6259e/FLAGaba54051f [2018-11-18 09:41:33,751 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/data/91ce7a501/f59a25cbfcdb4d7089f66df61ba6259e [2018-11-18 09:41:33,753 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 09:41:33,754 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-18 09:41:33,755 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 09:41:33,755 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 09:41:33,757 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 09:41:33,757 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,759 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33b9ba61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33, skipping insertion in model container [2018-11-18 09:41:33,759 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,766 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 09:41:33,776 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 09:41:33,876 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 09:41:33,878 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 09:41:33,886 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 09:41:33,894 INFO L195 MainTranslator]: Completed translation [2018-11-18 09:41:33,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33 WrapperNode [2018-11-18 09:41:33,895 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 09:41:33,895 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-18 09:41:33,895 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-18 09:41:33,895 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-18 09:41:33,900 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,903 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,907 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-18 09:41:33,907 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 09:41:33,907 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 09:41:33,907 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 09:41:33,912 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,912 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,913 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,913 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,915 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,918 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,918 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... [2018-11-18 09:41:33,919 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 09:41:33,919 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 09:41:33,919 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 09:41:33,919 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 09:41:33,920 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 09:41:33,998 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 09:41:33,999 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 09:41:33,999 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 09:41:33,999 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 09:41:33,999 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 09:41:33,999 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 09:41:33,999 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-18 09:41:33,999 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-18 09:41:34,088 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 09:41:34,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 09:41:34 BoogieIcfgContainer [2018-11-18 09:41:34,088 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 09:41:34,089 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 09:41:34,089 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 09:41:34,091 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 09:41:34,091 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 09:41:33" (1/3) ... [2018-11-18 09:41:34,092 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@720e5179 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 09:41:34, skipping insertion in model container [2018-11-18 09:41:34,092 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 09:41:33" (2/3) ... [2018-11-18 09:41:34,092 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@720e5179 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 09:41:34, skipping insertion in model container [2018-11-18 09:41:34,092 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 09:41:34" (3/3) ... [2018-11-18 09:41:34,094 INFO L112 eAbstractionObserver]: Analyzing ICFG underapprox_false-unreach-call1_true-termination.i [2018-11-18 09:41:34,102 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 09:41:34,107 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 09:41:34,121 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 09:41:34,147 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 09:41:34,147 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 09:41:34,147 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 09:41:34,147 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 09:41:34,147 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 09:41:34,147 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 09:41:34,147 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 09:41:34,147 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 09:41:34,160 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-11-18 09:41:34,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-18 09:41:34,164 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 09:41:34,164 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 09:41:34,166 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 09:41:34,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:34,171 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-11-18 09:41:34,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 09:41:34,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 09:41:34,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,212 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 09:41:34,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:34,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,246 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 09:41:34,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-18 09:41:34,246 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 09:41:34,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-18 09:41:34,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-18 09:41:34,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 09:41:34,258 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-11-18 09:41:34,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 09:41:34,271 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-11-18 09:41:34,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-18 09:41:34,272 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-18 09:41:34,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 09:41:34,277 INFO L225 Difference]: With dead ends: 29 [2018-11-18 09:41:34,277 INFO L226 Difference]: Without dead ends: 12 [2018-11-18 09:41:34,279 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 09:41:34,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-11-18 09:41:34,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-11-18 09:41:34,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-11-18 09:41:34,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-11-18 09:41:34,301 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-11-18 09:41:34,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 09:41:34,302 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-11-18 09:41:34,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-18 09:41:34,302 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-11-18 09:41:34,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-18 09:41:34,303 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 09:41:34,303 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 09:41:34,303 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 09:41:34,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:34,304 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-11-18 09:41:34,304 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 09:41:34,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 09:41:34,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,305 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 09:41:34,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:34,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,362 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 09:41:34,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 09:41:34,363 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 09:41:34,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-18 09:41:34,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-18 09:41:34,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 09:41:34,364 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-11-18 09:41:34,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 09:41:34,376 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-11-18 09:41:34,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-18 09:41:34,377 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-18 09:41:34,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 09:41:34,377 INFO L225 Difference]: With dead ends: 19 [2018-11-18 09:41:34,377 INFO L226 Difference]: Without dead ends: 14 [2018-11-18 09:41:34,378 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 09:41:34,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-18 09:41:34,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-18 09:41:34,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-18 09:41:34,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-11-18 09:41:34,380 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-11-18 09:41:34,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 09:41:34,380 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-11-18 09:41:34,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-18 09:41:34,380 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-11-18 09:41:34,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-18 09:41:34,380 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 09:41:34,380 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 09:41:34,381 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 09:41:34,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:34,381 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-11-18 09:41:34,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 09:41:34,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,382 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 09:41:34,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,382 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 09:41:34,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:34,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:34,456 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 09:41:34,457 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-11-18 09:41:34,458 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-11-18 09:41:34,478 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 09:41:34,478 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 09:41:34,578 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-18 09:41:34,578 INFO L272 AbstractInterpreter]: Visited 12 different actions 21 times. Merged at 2 different actions 6 times. Never widened. Performed 61 root evaluator evaluations with a maximum evaluation depth of 6. Performed 61 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 2 fixpoints after 2 different actions. Largest state had 3 variables. [2018-11-18 09:41:34,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:34,586 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-18 09:41:34,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:34,586 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 09:41:34,592 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 09:41:34,592 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 09:41:34,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:34,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 09:41:34,639 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,640 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 09:41:34,666 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,681 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 09:41:34,681 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-11-18 09:41:34,681 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 09:41:34,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 09:41:34,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 09:41:34,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2018-11-18 09:41:34,681 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 5 states. [2018-11-18 09:41:34,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 09:41:34,701 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-11-18 09:41:34,701 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 09:41:34,701 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-18 09:41:34,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 09:41:34,702 INFO L225 Difference]: With dead ends: 21 [2018-11-18 09:41:34,702 INFO L226 Difference]: Without dead ends: 16 [2018-11-18 09:41:34,702 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2018-11-18 09:41:34,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-18 09:41:34,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-18 09:41:34,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-18 09:41:34,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-11-18 09:41:34,706 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-11-18 09:41:34,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 09:41:34,707 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-11-18 09:41:34,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 09:41:34,707 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-11-18 09:41:34,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-18 09:41:34,707 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 09:41:34,707 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 09:41:34,707 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 09:41:34,707 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:34,707 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-11-18 09:41:34,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 09:41:34,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,708 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 09:41:34,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,708 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 09:41:34,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:34,789 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:34,790 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 09:41:34,790 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 09:41:34,790 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 09:41:34,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:34,790 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 09:41:34,798 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 09:41:34,798 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 09:41:34,807 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 09:41:34,807 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 09:41:34,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 09:41:34,840 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 09:41:34,866 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 09:41:34,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-11-18 09:41:34,887 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 09:41:34,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 09:41:34,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 09:41:34,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-11-18 09:41:34,888 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 6 states. [2018-11-18 09:41:34,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 09:41:34,903 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-11-18 09:41:34,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 09:41:34,903 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2018-11-18 09:41:34,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 09:41:34,904 INFO L225 Difference]: With dead ends: 23 [2018-11-18 09:41:34,904 INFO L226 Difference]: Without dead ends: 18 [2018-11-18 09:41:34,904 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-11-18 09:41:34,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-18 09:41:34,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-18 09:41:34,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-18 09:41:34,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-11-18 09:41:34,906 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-11-18 09:41:34,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 09:41:34,907 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-11-18 09:41:34,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 09:41:34,907 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-11-18 09:41:34,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-18 09:41:34,907 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 09:41:34,907 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 09:41:34,907 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 09:41:34,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:34,908 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-11-18 09:41:34,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 09:41:34,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 09:41:34,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:34,909 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 09:41:34,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:34,975 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:34,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:34,975 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 09:41:34,976 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 09:41:34,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 09:41:34,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:34,976 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 09:41:34,992 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 09:41:34,992 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 09:41:35,001 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 09:41:35,001 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 09:41:35,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 09:41:35,040 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:35,040 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 09:41:35,074 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:35,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 09:41:35,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-11-18 09:41:35,089 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 09:41:35,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 09:41:35,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 09:41:35,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2018-11-18 09:41:35,090 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 7 states. [2018-11-18 09:41:35,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 09:41:35,104 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-11-18 09:41:35,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 09:41:35,104 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2018-11-18 09:41:35,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 09:41:35,104 INFO L225 Difference]: With dead ends: 25 [2018-11-18 09:41:35,104 INFO L226 Difference]: Without dead ends: 20 [2018-11-18 09:41:35,105 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2018-11-18 09:41:35,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-18 09:41:35,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-11-18 09:41:35,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-11-18 09:41:35,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-11-18 09:41:35,107 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-11-18 09:41:35,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 09:41:35,107 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-11-18 09:41:35,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 09:41:35,107 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-11-18 09:41:35,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-18 09:41:35,108 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 09:41:35,108 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 09:41:35,108 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 09:41:35,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:35,108 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-11-18 09:41:35,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 09:41:35,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:35,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 09:41:35,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:35,109 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 09:41:35,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:35,172 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:35,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:35,173 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 09:41:35,173 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 09:41:35,173 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 09:41:35,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:35,173 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 09:41:35,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 09:41:35,181 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 09:41:35,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:35,189 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 09:41:35,224 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:35,225 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 09:41:35,281 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:35,296 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 09:41:35,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-11-18 09:41:35,296 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 09:41:35,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 09:41:35,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 09:41:35,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2018-11-18 09:41:35,297 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 8 states. [2018-11-18 09:41:35,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 09:41:35,335 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-11-18 09:41:35,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 09:41:35,335 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2018-11-18 09:41:35,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 09:41:35,336 INFO L225 Difference]: With dead ends: 27 [2018-11-18 09:41:35,336 INFO L226 Difference]: Without dead ends: 22 [2018-11-18 09:41:35,336 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2018-11-18 09:41:35,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-18 09:41:35,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-11-18 09:41:35,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-11-18 09:41:35,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-11-18 09:41:35,339 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-11-18 09:41:35,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 09:41:35,339 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-11-18 09:41:35,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 09:41:35,339 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-11-18 09:41:35,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-18 09:41:35,340 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 09:41:35,340 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 09:41:35,340 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 09:41:35,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:35,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-11-18 09:41:35,341 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 09:41:35,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:35,341 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 09:41:35,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:35,341 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 09:41:35,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 09:41:35,414 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:35,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:35,415 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 09:41:35,415 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 09:41:35,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 09:41:35,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 09:41:35,415 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 09:41:35,421 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 09:41:35,421 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 09:41:35,435 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-18 09:41:35,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 09:41:35,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 09:41:35,458 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:35,459 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 09:41:35,515 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 09:41:35,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 09:41:35,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-11-18 09:41:35,529 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 09:41:35,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 09:41:35,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 09:41:35,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2018-11-18 09:41:35,530 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 9 states. [2018-11-18 09:41:35,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 09:41:35,562 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-11-18 09:41:35,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-18 09:41:35,562 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2018-11-18 09:41:35,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 09:41:35,563 INFO L225 Difference]: With dead ends: 29 [2018-11-18 09:41:35,563 INFO L226 Difference]: Without dead ends: 24 [2018-11-18 09:41:35,563 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2018-11-18 09:41:35,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-18 09:41:35,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-18 09:41:35,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-18 09:41:35,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-11-18 09:41:35,566 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-11-18 09:41:35,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 09:41:35,566 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-11-18 09:41:35,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 09:41:35,566 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-11-18 09:41:35,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-18 09:41:35,567 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 09:41:35,567 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 09:41:35,567 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 09:41:35,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 09:41:35,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-11-18 09:41:35,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 09:41:35,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:35,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 09:41:35,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 09:41:35,569 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 09:41:35,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 09:41:35,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 09:41:35,596 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-18 09:41:35,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 09:41:35 BoogieIcfgContainer [2018-11-18 09:41:35,617 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 09:41:35,618 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 09:41:35,618 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 09:41:35,618 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 09:41:35,619 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 09:41:34" (3/4) ... [2018-11-18 09:41:35,620 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-18 09:41:35,657 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_a3c6f0c4-9400-4059-85ca-e246aabe8f94/bin-2019/utaipan/witness.graphml [2018-11-18 09:41:35,657 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 09:41:35,657 INFO L168 Benchmark]: Toolchain (without parser) took 1903.89 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.3 MB). Free memory was 959.2 MB in the beginning and 922.9 MB in the end (delta: 36.3 MB). Peak memory consumption was 171.6 MB. Max. memory is 11.5 GB. [2018-11-18 09:41:35,659 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. [2018-11-18 09:41:35,660 INFO L168 Benchmark]: CACSL2BoogieTranslator took 140.25 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 947.4 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. [2018-11-18 09:41:35,660 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.71 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. [2018-11-18 09:41:35,660 INFO L168 Benchmark]: Boogie Preprocessor took 11.89 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. [2018-11-18 09:41:35,660 INFO L168 Benchmark]: RCFGBuilder took 169.34 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.3 MB). Free memory was 944.7 MB in the beginning and 1.1 GB in the end (delta: -179.0 MB). Peak memory consumption was 14.4 MB. Max. memory is 11.5 GB. [2018-11-18 09:41:35,661 INFO L168 Benchmark]: TraceAbstraction took 1528.63 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 925.6 MB in the end (delta: 198.2 MB). Peak memory consumption was 198.2 MB. Max. memory is 11.5 GB. [2018-11-18 09:41:35,661 INFO L168 Benchmark]: Witness Printer took 39.03 ms. Allocated memory is still 1.2 GB. Free memory was 925.6 MB in the beginning and 922.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 09:41:35,663 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 140.25 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 947.4 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.71 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 11.89 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 169.34 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.3 MB). Free memory was 944.7 MB in the beginning and 1.1 GB in the end (delta: -179.0 MB). Peak memory consumption was 14.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1528.63 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 925.6 MB in the end (delta: 198.2 MB). Peak memory consumption was 198.2 MB. Max. memory is 11.5 GB. * Witness Printer took 39.03 ms. Allocated memory is still 1.2 GB. Free memory was 925.6 MB in the beginning and 922.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L9] unsigned int x = 0; [L10] unsigned int y = 1; VAL [x=0, y=1] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=1, y=2] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=2, y=4] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=3, y=8] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=4, y=16] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=5, y=32] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=6, y=64] [L11] COND FALSE !(x < 6) VAL [x=6, y=64] [L15] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L3] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L4] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. UNSAFE Result, 1.4s OverallTime, 8 OverallIterations, 7 TraceHistogramMax, 0.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 99 SDtfs, 0 SDslu, 228 SDs, 0 SdLazy, 129 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 200 GetRequests, 149 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=7, 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, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 214 NumberOfCodeBlocks, 214 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 259 ConstructedInterpolants, 0 QuantifiedInterpolants, 16821 SizeOfPredicates, 5 NumberOfNonLiveVariables, 215 ConjunctsInSsa, 45 ConjunctsInUnsatCore, 17 InterpolantComputations, 2 PerfectInterpolantSequences, 0/210 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...