./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/nested_true-unreach-call1.i --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_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/nested_true-unreach-call1.i -s /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 a5caa00ae79e87f00b53813a39ed64b4be57c6c3 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 08:14:56,925 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-23 08:14:56,926 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-23 08:14:56,934 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-23 08:14:56,934 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-23 08:14:56,935 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-23 08:14:56,936 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-23 08:14:56,937 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-23 08:14:56,938 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-23 08:14:56,938 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-23 08:14:56,939 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-23 08:14:56,939 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-23 08:14:56,940 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-23 08:14:56,940 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-23 08:14:56,942 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-23 08:14:56,942 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-23 08:14:56,943 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-23 08:14:56,944 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-23 08:14:56,946 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-23 08:14:56,947 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-23 08:14:56,948 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-23 08:14:56,948 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-23 08:14:56,950 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-23 08:14:56,951 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-23 08:14:56,951 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-23 08:14:56,952 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-23 08:14:56,952 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-23 08:14:56,953 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-23 08:14:56,954 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-23 08:14:56,955 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-23 08:14:56,955 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-23 08:14:56,955 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-23 08:14:56,955 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-23 08:14:56,956 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-23 08:14:56,956 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-23 08:14:56,957 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-23 08:14:56,958 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-23 08:14:56,965 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-23 08:14:56,965 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-23 08:14:56,966 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-23 08:14:56,966 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-23 08:14:56,966 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-23 08:14:56,966 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-23 08:14:56,966 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-23 08:14:56,966 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-23 08:14:56,966 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-23 08:14:56,967 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-23 08:14:56,967 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-23 08:14:56,967 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-23 08:14:56,967 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-23 08:14:56,968 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-23 08:14:56,968 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-23 08:14:56,968 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-23 08:14:56,968 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-23 08:14:56,968 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-23 08:14:56,968 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-23 08:14:56,968 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-23 08:14:56,968 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-23 08:14:56,969 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-23 08:14:56,969 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-23 08:14:56,969 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-23 08:14:56,971 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-23 08:14:56,971 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-23 08:14:56,971 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-23 08:14:56,972 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-23 08:14:56,972 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-23 08:14:56,972 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-23 08:14:56,972 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-23 08:14:56,972 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-23 08:14:56,972 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-23 08:14:56,972 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-23 08:14:56,972 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-23 08:14:56,973 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-23 08:14:56,973 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-23 08:14:56,973 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_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 -> a5caa00ae79e87f00b53813a39ed64b4be57c6c3 [2018-11-23 08:14:56,998 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-23 08:14:57,007 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-23 08:14:57,010 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-23 08:14:57,011 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-23 08:14:57,011 INFO L276 PluginConnector]: CDTParser initialized [2018-11-23 08:14:57,012 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/../../sv-benchmarks/c/loop-acceleration/nested_true-unreach-call1.i [2018-11-23 08:14:57,053 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/data/adcd4fde8/d0cccc63926f4e93afaa636cb284b11f/FLAG5db32f64a [2018-11-23 08:14:57,400 INFO L307 CDTParser]: Found 1 translation units. [2018-11-23 08:14:57,400 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/sv-benchmarks/c/loop-acceleration/nested_true-unreach-call1.i [2018-11-23 08:14:57,404 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/data/adcd4fde8/d0cccc63926f4e93afaa636cb284b11f/FLAG5db32f64a [2018-11-23 08:14:57,820 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/data/adcd4fde8/d0cccc63926f4e93afaa636cb284b11f [2018-11-23 08:14:57,822 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-23 08:14:57,823 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-23 08:14:57,824 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-23 08:14:57,824 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-23 08:14:57,827 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-23 08:14:57,828 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:57,830 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12858536 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57, skipping insertion in model container [2018-11-23 08:14:57,830 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:57,838 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-23 08:14:57,849 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-23 08:14:57,952 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 08:14:57,954 INFO L191 MainTranslator]: Completed pre-run [2018-11-23 08:14:57,963 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 08:14:57,971 INFO L195 MainTranslator]: Completed translation [2018-11-23 08:14:57,971 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57 WrapperNode [2018-11-23 08:14:57,971 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-23 08:14:57,972 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-23 08:14:57,972 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-23 08:14:57,972 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-23 08:14:57,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:57,983 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:57,989 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-23 08:14:57,989 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-23 08:14:57,989 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-23 08:14:57,989 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-23 08:14:57,998 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:57,998 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:57,999 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:57,999 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:58,002 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:58,006 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:58,006 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... [2018-11-23 08:14:58,007 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-23 08:14:58,008 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-23 08:14:58,008 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-23 08:14:58,008 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-23 08:14:58,009 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:14:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-23 08:14:58,089 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-23 08:14:58,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-23 08:14:58,089 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-23 08:14:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-23 08:14:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-23 08:14:58,090 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-23 08:14:58,090 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-23 08:14:58,202 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-23 08:14:58,202 INFO L280 CfgBuilder]: Removed 2 assue(true) statements. [2018-11-23 08:14:58,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:14:58 BoogieIcfgContainer [2018-11-23 08:14:58,203 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-23 08:14:58,203 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-23 08:14:58,203 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-23 08:14:58,205 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-23 08:14:58,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:14:57" (1/3) ... [2018-11-23 08:14:58,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ca2207f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:14:58, skipping insertion in model container [2018-11-23 08:14:58,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:14:57" (2/3) ... [2018-11-23 08:14:58,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ca2207f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:14:58, skipping insertion in model container [2018-11-23 08:14:58,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:14:58" (3/3) ... [2018-11-23 08:14:58,208 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_true-unreach-call1.i [2018-11-23 08:14:58,217 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-23 08:14:58,223 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-23 08:14:58,235 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-23 08:14:58,255 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-23 08:14:58,255 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-23 08:14:58,255 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-23 08:14:58,255 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-23 08:14:58,255 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-23 08:14:58,256 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-23 08:14:58,256 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-23 08:14:58,256 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-23 08:14:58,268 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-11-23 08:14:58,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-23 08:14:58,272 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:14:58,272 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:14:58,274 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:14:58,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:14:58,278 INFO L82 PathProgramCache]: Analyzing trace with hash -873786703, now seen corresponding path program 1 times [2018-11-23 08:14:58,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:14:58,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:58,308 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:14:58,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:58,309 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:14:58,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:14:58,414 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 08:14:58,415 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-23 08:14:58,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-23 08:14:58,415 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 08:14:58,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-23 08:14:58,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-23 08:14:58,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-23 08:14:58,432 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2018-11-23 08:14:58,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:14:58,455 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2018-11-23 08:14:58,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-23 08:14:58,456 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2018-11-23 08:14:58,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:14:58,464 INFO L225 Difference]: With dead ends: 36 [2018-11-23 08:14:58,464 INFO L226 Difference]: Without dead ends: 16 [2018-11-23 08:14:58,467 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-23 08:14:58,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-23 08:14:58,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2018-11-23 08:14:58,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-23 08:14:58,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-11-23 08:14:58,494 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-11-23 08:14:58,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:14:58,494 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-11-23 08:14:58,495 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-23 08:14:58,495 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-11-23 08:14:58,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-23 08:14:58,495 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:14:58,495 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:14:58,496 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:14:58,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:14:58,496 INFO L82 PathProgramCache]: Analyzing trace with hash 1621360120, now seen corresponding path program 1 times [2018-11-23 08:14:58,496 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:14:58,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:58,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:14:58,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:58,497 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:14:58,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:14:58,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-23 08:14:58,550 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-23 08:14:58,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-23 08:14:58,551 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 08:14:58,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-23 08:14:58,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-23 08:14:58,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-23 08:14:58,552 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2018-11-23 08:14:58,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:14:58,566 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2018-11-23 08:14:58,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-23 08:14:58,566 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-11-23 08:14:58,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:14:58,566 INFO L225 Difference]: With dead ends: 23 [2018-11-23 08:14:58,567 INFO L226 Difference]: Without dead ends: 15 [2018-11-23 08:14:58,567 INFO L631 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 [2018-11-23 08:14:58,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-11-23 08:14:58,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-11-23 08:14:58,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-11-23 08:14:58,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-11-23 08:14:58,569 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-11-23 08:14:58,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:14:58,570 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-11-23 08:14:58,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-23 08:14:58,570 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-11-23 08:14:58,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-23 08:14:58,570 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:14:58,570 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:14:58,571 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:14:58,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:14:58,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1574756514, now seen corresponding path program 1 times [2018-11-23 08:14:58,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:14:58,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:58,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:14:58,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:58,572 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:14:58,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:14:58,626 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-23 08:14:58,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:14:58,626 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:14:58,627 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-23 08:14:58,628 INFO L202 CegarAbsIntRunner]: [0], [4], [11], [13], [20], [22], [26], [32], [35], [37], [43], [44], [45], [47] [2018-11-23 08:14:58,650 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-23 08:14:58,650 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-23 08:14:58,787 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-23 08:14:58,788 INFO L272 AbstractInterpreter]: Visited 14 different actions 32 times. Merged at 4 different actions 10 times. Widened at 2 different actions 2 times. Performed 104 root evaluator evaluations with a maximum evaluation depth of 12. Performed 104 inverse root evaluator evaluations with a maximum inverse evaluation depth of 12. Found 5 fixpoints after 3 different actions. Largest state had 4 variables. [2018-11-23 08:14:58,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:14:58,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-23 08:14:58,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:14:58,798 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:14:58,805 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:14:58,805 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 08:14:58,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:14:58,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:14:58,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-23 08:14:58,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:14:58,896 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-23 08:14:58,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:14:58,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4] total 9 [2018-11-23 08:14:58,912 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:14:58,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-23 08:14:58,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-23 08:14:58,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2018-11-23 08:14:58,913 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 7 states. [2018-11-23 08:14:58,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:14:58,966 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2018-11-23 08:14:58,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-23 08:14:58,966 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2018-11-23 08:14:58,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:14:58,967 INFO L225 Difference]: With dead ends: 34 [2018-11-23 08:14:58,967 INFO L226 Difference]: Without dead ends: 25 [2018-11-23 08:14:58,968 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-23 08:14:58,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-23 08:14:58,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2018-11-23 08:14:58,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-23 08:14:58,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-11-23 08:14:58,971 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 14 [2018-11-23 08:14:58,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:14:58,971 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-11-23 08:14:58,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-23 08:14:58,971 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-11-23 08:14:58,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-23 08:14:58,972 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:14:58,972 INFO L402 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:14:58,972 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:14:58,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:14:58,973 INFO L82 PathProgramCache]: Analyzing trace with hash 93409041, now seen corresponding path program 2 times [2018-11-23 08:14:58,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:14:58,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:58,973 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:14:58,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:58,974 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:14:58,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:14:59,038 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-11-23 08:14:59,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:14:59,039 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:14:59,039 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:14:59,039 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:14:59,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:14:59,039 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:14:59,051 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 08:14:59,051 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 08:14:59,069 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-23 08:14:59,069 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 08:14:59,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:14:59,123 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-23 08:14:59,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:14:59,159 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-23 08:14:59,173 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:14:59,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 5] total 13 [2018-11-23 08:14:59,174 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:14:59,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-23 08:14:59,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-23 08:14:59,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2018-11-23 08:14:59,175 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 10 states. [2018-11-23 08:14:59,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:14:59,344 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2018-11-23 08:14:59,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-23 08:14:59,345 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2018-11-23 08:14:59,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:14:59,346 INFO L225 Difference]: With dead ends: 46 [2018-11-23 08:14:59,346 INFO L226 Difference]: Without dead ends: 34 [2018-11-23 08:14:59,346 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2018-11-23 08:14:59,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-23 08:14:59,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2018-11-23 08:14:59,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-23 08:14:59,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2018-11-23 08:14:59,353 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 20 [2018-11-23 08:14:59,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:14:59,354 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2018-11-23 08:14:59,354 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-23 08:14:59,354 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2018-11-23 08:14:59,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-11-23 08:14:59,355 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:14:59,355 INFO L402 BasicCegarLoop]: trace histogram [9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:14:59,356 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:14:59,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:14:59,356 INFO L82 PathProgramCache]: Analyzing trace with hash 50981508, now seen corresponding path program 3 times [2018-11-23 08:14:59,357 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:14:59,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:59,357 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 08:14:59,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:59,358 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:14:59,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:14:59,424 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 35 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2018-11-23 08:14:59,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:14:59,424 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:14:59,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:14:59,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:14:59,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:14:59,425 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:14:59,437 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 08:14:59,437 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 08:14:59,449 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 08:14:59,450 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 08:14:59,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:14:59,518 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-23 08:14:59,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:14:59,574 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-23 08:14:59,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:14:59,590 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 6] total 17 [2018-11-23 08:14:59,590 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:14:59,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-23 08:14:59,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-23 08:14:59,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-11-23 08:14:59,591 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 13 states. [2018-11-23 08:14:59,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:14:59,798 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2018-11-23 08:14:59,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-23 08:14:59,798 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2018-11-23 08:14:59,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:14:59,799 INFO L225 Difference]: With dead ends: 64 [2018-11-23 08:14:59,799 INFO L226 Difference]: Without dead ends: 45 [2018-11-23 08:14:59,799 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=196, Invalid=674, Unknown=0, NotChecked=0, Total=870 [2018-11-23 08:14:59,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-23 08:14:59,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2018-11-23 08:14:59,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-23 08:14:59,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2018-11-23 08:14:59,806 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 28 [2018-11-23 08:14:59,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:14:59,806 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2018-11-23 08:14:59,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-23 08:14:59,807 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2018-11-23 08:14:59,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-11-23 08:14:59,809 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:14:59,810 INFO L402 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:14:59,810 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:14:59,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:14:59,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1027694321, now seen corresponding path program 4 times [2018-11-23 08:14:59,810 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:14:59,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:59,811 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 08:14:59,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:14:59,811 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:14:59,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:14:59,905 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 0 proven. 166 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-23 08:14:59,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:14:59,905 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:14:59,906 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:14:59,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:14:59,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:14:59,906 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:14:59,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:14:59,913 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 08:14:59,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:14:59,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:14:59,988 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-11-23 08:14:59,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:15:00,076 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 0 proven. 166 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-23 08:15:00,102 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:15:00,102 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 7] total 17 [2018-11-23 08:15:00,102 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:15:00,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-23 08:15:00,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-23 08:15:00,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2018-11-23 08:15:00,103 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2018-11-23 08:15:00,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:15:00,184 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2018-11-23 08:15:00,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-23 08:15:00,188 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-11-23 08:15:00,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:15:00,189 INFO L225 Difference]: With dead ends: 57 [2018-11-23 08:15:00,189 INFO L226 Difference]: Without dead ends: 52 [2018-11-23 08:15:00,189 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2018-11-23 08:15:00,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-23 08:15:00,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2018-11-23 08:15:00,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-23 08:15:00,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2018-11-23 08:15:00,197 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 38 [2018-11-23 08:15:00,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:15:00,197 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2018-11-23 08:15:00,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-23 08:15:00,197 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2018-11-23 08:15:00,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-11-23 08:15:00,198 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:15:00,198 INFO L402 BasicCegarLoop]: trace histogram [20, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:15:00,198 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:15:00,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:15:00,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1398553544, now seen corresponding path program 5 times [2018-11-23 08:15:00,198 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:15:00,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:00,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:15:00,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:00,199 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:15:00,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:00,328 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 275 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-11-23 08:15:00,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:00,329 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:15:00,329 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:15:00,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:15:00,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:00,329 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:15:00,336 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 08:15:00,336 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 08:15:00,364 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-23 08:15:00,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 08:15:00,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:15:00,415 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 109 proven. 10 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-11-23 08:15:00,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:15:00,478 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 109 proven. 10 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-11-23 08:15:00,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:15:00,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 18 [2018-11-23 08:15:00,494 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:15:00,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-23 08:15:00,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-23 08:15:00,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2018-11-23 08:15:00,495 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 13 states. [2018-11-23 08:15:00,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:15:00,894 INFO L93 Difference]: Finished difference Result 101 states and 120 transitions. [2018-11-23 08:15:00,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-23 08:15:00,895 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 45 [2018-11-23 08:15:00,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:15:00,895 INFO L225 Difference]: With dead ends: 101 [2018-11-23 08:15:00,895 INFO L226 Difference]: Without dead ends: 66 [2018-11-23 08:15:00,896 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=383, Invalid=1873, Unknown=0, NotChecked=0, Total=2256 [2018-11-23 08:15:00,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-23 08:15:00,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 59. [2018-11-23 08:15:00,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-23 08:15:00,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 65 transitions. [2018-11-23 08:15:00,902 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 65 transitions. Word has length 45 [2018-11-23 08:15:00,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:15:00,903 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 65 transitions. [2018-11-23 08:15:00,903 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-23 08:15:00,903 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 65 transitions. [2018-11-23 08:15:00,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-11-23 08:15:00,903 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:15:00,904 INFO L402 BasicCegarLoop]: trace histogram [30, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:15:00,904 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:15:00,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:15:00,904 INFO L82 PathProgramCache]: Analyzing trace with hash -323381161, now seen corresponding path program 6 times [2018-11-23 08:15:00,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:15:00,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:00,905 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 08:15:00,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:00,905 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:15:00,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:01,010 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2018-11-23 08:15:01,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:01,010 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:15:01,011 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:15:01,011 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:15:01,011 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:01,011 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:15:01,018 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 08:15:01,018 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 08:15:01,035 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 08:15:01,035 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 08:15:01,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:15:01,078 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 186 proven. 15 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2018-11-23 08:15:01,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:15:01,158 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 186 proven. 15 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2018-11-23 08:15:01,173 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:15:01,173 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2018-11-23 08:15:01,173 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:15:01,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-23 08:15:01,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-23 08:15:01,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2018-11-23 08:15:01,174 INFO L87 Difference]: Start difference. First operand 59 states and 65 transitions. Second operand 15 states. [2018-11-23 08:15:01,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:15:01,777 INFO L93 Difference]: Finished difference Result 129 states and 151 transitions. [2018-11-23 08:15:01,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-23 08:15:01,778 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 58 [2018-11-23 08:15:01,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:15:01,779 INFO L225 Difference]: With dead ends: 129 [2018-11-23 08:15:01,779 INFO L226 Difference]: Without dead ends: 82 [2018-11-23 08:15:01,780 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 878 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=565, Invalid=3341, Unknown=0, NotChecked=0, Total=3906 [2018-11-23 08:15:01,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-11-23 08:15:01,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 74. [2018-11-23 08:15:01,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-11-23 08:15:01,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 81 transitions. [2018-11-23 08:15:01,798 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 81 transitions. Word has length 58 [2018-11-23 08:15:01,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:15:01,798 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 81 transitions. [2018-11-23 08:15:01,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-23 08:15:01,799 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 81 transitions. [2018-11-23 08:15:01,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-23 08:15:01,800 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:15:01,800 INFO L402 BasicCegarLoop]: trace histogram [42, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:15:01,800 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:15:01,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:15:01,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1645944296, now seen corresponding path program 7 times [2018-11-23 08:15:01,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:15:01,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:01,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 08:15:01,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:01,801 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:15:01,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:01,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1078 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2018-11-23 08:15:01,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:01,943 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:15:01,944 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:15:01,944 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:15:01,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:01,944 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:15:01,970 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:15:01,970 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 08:15:02,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:02,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:15:02,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 301 proven. 21 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2018-11-23 08:15:02,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:15:02,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 301 proven. 21 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2018-11-23 08:15:02,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:15:02,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2018-11-23 08:15:02,223 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:15:02,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-23 08:15:02,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-23 08:15:02,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=457, Unknown=0, NotChecked=0, Total=552 [2018-11-23 08:15:02,224 INFO L87 Difference]: Start difference. First operand 74 states and 81 transitions. Second operand 17 states. [2018-11-23 08:15:02,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:15:02,966 INFO L93 Difference]: Finished difference Result 161 states and 186 transitions. [2018-11-23 08:15:02,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-23 08:15:02,966 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 73 [2018-11-23 08:15:02,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:15:02,966 INFO L225 Difference]: With dead ends: 161 [2018-11-23 08:15:02,966 INFO L226 Difference]: Without dead ends: 100 [2018-11-23 08:15:02,967 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1569 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=761, Invalid=5559, Unknown=0, NotChecked=0, Total=6320 [2018-11-23 08:15:02,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-11-23 08:15:02,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 91. [2018-11-23 08:15:02,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-11-23 08:15:02,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 99 transitions. [2018-11-23 08:15:02,979 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 99 transitions. Word has length 73 [2018-11-23 08:15:02,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:15:02,979 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 99 transitions. [2018-11-23 08:15:02,979 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-23 08:15:02,979 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 99 transitions. [2018-11-23 08:15:02,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-11-23 08:15:02,980 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:15:02,980 INFO L402 BasicCegarLoop]: trace histogram [56, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:15:02,980 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:15:02,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:15:02,981 INFO L82 PathProgramCache]: Analyzing trace with hash -196329159, now seen corresponding path program 8 times [2018-11-23 08:15:02,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:15:02,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:02,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:15:02,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:02,982 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:15:02,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:03,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 1856 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-11-23 08:15:03,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:03,122 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:15:03,122 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:15:03,122 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:15:03,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:03,122 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:15:03,130 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 08:15:03,130 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 08:15:03,242 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-23 08:15:03,242 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 08:15:03,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:15:03,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 463 proven. 28 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-11-23 08:15:03,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:15:03,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 463 proven. 28 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-11-23 08:15:03,466 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:15:03,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 27 [2018-11-23 08:15:03,467 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:15:03,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-23 08:15:03,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-23 08:15:03,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=594, Unknown=0, NotChecked=0, Total=702 [2018-11-23 08:15:03,468 INFO L87 Difference]: Start difference. First operand 91 states and 99 transitions. Second operand 19 states. [2018-11-23 08:15:04,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:15:04,695 INFO L93 Difference]: Finished difference Result 197 states and 225 transitions. [2018-11-23 08:15:04,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-11-23 08:15:04,695 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 90 [2018-11-23 08:15:04,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:15:04,696 INFO L225 Difference]: With dead ends: 197 [2018-11-23 08:15:04,696 INFO L226 Difference]: Without dead ends: 120 [2018-11-23 08:15:04,697 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 165 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2597 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=965, Invalid=8737, Unknown=0, NotChecked=0, Total=9702 [2018-11-23 08:15:04,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-11-23 08:15:04,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 110. [2018-11-23 08:15:04,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-11-23 08:15:04,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 119 transitions. [2018-11-23 08:15:04,715 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 119 transitions. Word has length 90 [2018-11-23 08:15:04,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:15:04,715 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 119 transitions. [2018-11-23 08:15:04,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-23 08:15:04,715 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 119 transitions. [2018-11-23 08:15:04,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-23 08:15:04,716 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:15:04,716 INFO L402 BasicCegarLoop]: trace histogram [72, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:15:04,717 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:15:04,717 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:15:04,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1568752520, now seen corresponding path program 9 times [2018-11-23 08:15:04,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:15:04,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:04,720 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 08:15:04,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:04,720 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:15:04,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:04,883 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 0 proven. 2997 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2018-11-23 08:15:04,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:04,883 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:15:04,884 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:15:04,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:15:04,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:04,884 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:15:04,895 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 08:15:04,895 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 08:15:04,926 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 08:15:04,926 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 08:15:04,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:15:05,031 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 657 proven. 36 refuted. 0 times theorem prover too weak. 2628 trivial. 0 not checked. [2018-11-23 08:15:05,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:15:05,227 INFO L134 CoverageAnalysis]: Checked inductivity of 3321 backedges. 657 proven. 36 refuted. 0 times theorem prover too weak. 2628 trivial. 0 not checked. [2018-11-23 08:15:05,244 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:15:05,244 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 30 [2018-11-23 08:15:05,244 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:15:05,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-23 08:15:05,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-23 08:15:05,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=751, Unknown=0, NotChecked=0, Total=870 [2018-11-23 08:15:05,246 INFO L87 Difference]: Start difference. First operand 110 states and 119 transitions. Second operand 21 states. [2018-11-23 08:15:06,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:15:06,911 INFO L93 Difference]: Finished difference Result 237 states and 268 transitions. [2018-11-23 08:15:06,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-11-23 08:15:06,911 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-11-23 08:15:06,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:15:06,912 INFO L225 Difference]: With dead ends: 237 [2018-11-23 08:15:06,912 INFO L226 Difference]: Without dead ends: 142 [2018-11-23 08:15:06,915 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 202 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4058 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1171, Invalid=13109, Unknown=0, NotChecked=0, Total=14280 [2018-11-23 08:15:06,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-23 08:15:06,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 131. [2018-11-23 08:15:06,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-11-23 08:15:06,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 141 transitions. [2018-11-23 08:15:06,931 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 141 transitions. Word has length 109 [2018-11-23 08:15:06,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:15:06,932 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 141 transitions. [2018-11-23 08:15:06,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-23 08:15:06,932 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 141 transitions. [2018-11-23 08:15:06,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-11-23 08:15:06,935 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:15:06,935 INFO L402 BasicCegarLoop]: trace histogram [90, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:15:06,935 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:15:06,935 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:15:06,936 INFO L82 PathProgramCache]: Analyzing trace with hash 342435995, now seen corresponding path program 10 times [2018-11-23 08:15:06,936 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:15:06,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:06,936 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 08:15:06,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:06,937 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:15:06,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:07,076 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 0 proven. 4600 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2018-11-23 08:15:07,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:07,077 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:15:07,077 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:15:07,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:15:07,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:07,078 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:15:07,085 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:15:07,085 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 08:15:07,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:07,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:15:07,251 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 910 proven. 45 refuted. 0 times theorem prover too weak. 4095 trivial. 0 not checked. [2018-11-23 08:15:07,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:15:07,495 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 910 proven. 45 refuted. 0 times theorem prover too weak. 4095 trivial. 0 not checked. [2018-11-23 08:15:07,513 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 08:15:07,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 33 [2018-11-23 08:15:07,513 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 08:15:07,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-23 08:15:07,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-23 08:15:07,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=928, Unknown=0, NotChecked=0, Total=1056 [2018-11-23 08:15:07,514 INFO L87 Difference]: Start difference. First operand 131 states and 141 transitions. Second operand 23 states. [2018-11-23 08:15:09,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:15:09,579 INFO L93 Difference]: Finished difference Result 281 states and 315 transitions. [2018-11-23 08:15:09,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-11-23 08:15:09,579 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 130 [2018-11-23 08:15:09,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:15:09,580 INFO L225 Difference]: With dead ends: 281 [2018-11-23 08:15:09,580 INFO L226 Difference]: Without dead ends: 166 [2018-11-23 08:15:09,584 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 242 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6060 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1373, Invalid=18933, Unknown=0, NotChecked=0, Total=20306 [2018-11-23 08:15:09,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-11-23 08:15:09,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 154. [2018-11-23 08:15:09,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-23 08:15:09,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 165 transitions. [2018-11-23 08:15:09,604 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 165 transitions. Word has length 130 [2018-11-23 08:15:09,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:15:09,605 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 165 transitions. [2018-11-23 08:15:09,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-23 08:15:09,605 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 165 transitions. [2018-11-23 08:15:09,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-11-23 08:15:09,606 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 08:15:09,606 INFO L402 BasicCegarLoop]: trace histogram [110, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 08:15:09,607 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 08:15:09,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 08:15:09,607 INFO L82 PathProgramCache]: Analyzing trace with hash -57777320, now seen corresponding path program 11 times [2018-11-23 08:15:09,607 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 08:15:09,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:09,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 08:15:09,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 08:15:09,608 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 08:15:09,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 08:15:09,807 INFO L134 CoverageAnalysis]: Checked inductivity of 7381 backedges. 0 proven. 6776 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2018-11-23 08:15:09,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:09,807 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 08:15:09,808 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 08:15:09,808 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 08:15:09,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 08:15:09,808 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/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 08:15:09,814 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 08:15:09,815 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 08:15:22,546 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-11-23 08:15:22,546 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 08:15:22,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 08:15:38,975 WARN L180 SmtUtils]: Spent 12.08 s on a formula simplification. DAG size of input: 90 DAG size of output: 19 [2018-11-23 08:15:45,302 INFO L134 CoverageAnalysis]: Checked inductivity of 7381 backedges. 1231 proven. 0 refuted. 0 times theorem prover too weak. 6150 trivial. 0 not checked. [2018-11-23 08:15:45,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 08:15:53,545 INFO L134 CoverageAnalysis]: Checked inductivity of 7381 backedges. 1231 proven. 0 refuted. 0 times theorem prover too weak. 6150 trivial. 0 not checked. [2018-11-23 08:15:53,549 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-23 08:15:53,549 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [14] total 24 [2018-11-23 08:15:53,549 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 08:15:53,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-23 08:15:53,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-23 08:15:53,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=432, Unknown=6, NotChecked=0, Total=552 [2018-11-23 08:15:53,550 INFO L87 Difference]: Start difference. First operand 154 states and 165 transitions. Second operand 7 states. [2018-11-23 08:15:56,324 WARN L180 SmtUtils]: Spent 1.41 s on a formula simplification that was a NOOP. DAG size: 24 [2018-11-23 08:15:56,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 08:15:56,325 INFO L93 Difference]: Finished difference Result 154 states and 165 transitions. [2018-11-23 08:15:56,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-23 08:15:56,325 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 153 [2018-11-23 08:15:56,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 08:15:56,326 INFO L225 Difference]: With dead ends: 154 [2018-11-23 08:15:56,326 INFO L226 Difference]: Without dead ends: 0 [2018-11-23 08:15:56,327 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 297 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 33.7s TimeCoverageRelationStatistics Valid=136, Invalid=508, Unknown=6, NotChecked=0, Total=650 [2018-11-23 08:15:56,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-23 08:15:56,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-23 08:15:56,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-23 08:15:56,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-23 08:15:56,327 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 153 [2018-11-23 08:15:56,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 08:15:56,327 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-23 08:15:56,327 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-23 08:15:56,327 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-23 08:15:56,328 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-23 08:15:56,331 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-23 08:15:56,504 WARN L180 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 355 DAG size of output: 16 [2018-11-23 08:15:56,617 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-23 08:15:56,617 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-23 08:15:56,617 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-23 08:15:56,617 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-23 08:15:56,618 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-23 08:15:56,618 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-23 08:15:56,618 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 8 19) no Hoare annotation was computed. [2018-11-23 08:15:56,618 INFO L448 ceAbstractionStarter]: For program point mainFINAL(lines 8 19) no Hoare annotation was computed. [2018-11-23 08:15:56,618 INFO L444 ceAbstractionStarter]: At program point L13-2(lines 13 15) the Hoare annotation is: (or (and (<= main_~x~0 0) (<= 0 main_~x~0)) (and (< (mod (+ main_~x~0 4294967295) 4294967296) 268435455) (< (mod main_~x~0 4294967296) 268435455))) [2018-11-23 08:15:56,618 INFO L448 ceAbstractionStarter]: For program point L13-3(lines 13 15) no Hoare annotation was computed. [2018-11-23 08:15:56,618 INFO L444 ceAbstractionStarter]: At program point L11-2(lines 11 17) the Hoare annotation is: (or (< (mod (+ main_~x~0 4294967295) 4294967296) 268435455) (and (<= 0 main_~y~0) (<= main_~x~0 0) (<= 0 main_~x~0) (<= main_~y~0 0))) [2018-11-23 08:15:56,618 INFO L444 ceAbstractionStarter]: At program point L11-3(lines 11 17) the Hoare annotation is: (and (< (mod (+ main_~x~0 4294967295) 4294967296) 268435455) (<= 268435455 (mod main_~x~0 4294967296))) [2018-11-23 08:15:56,618 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 8 19) the Hoare annotation is: true [2018-11-23 08:15:56,618 INFO L448 ceAbstractionStarter]: For program point L3-2(lines 2 7) no Hoare annotation was computed. [2018-11-23 08:15:56,618 INFO L451 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 2 7) the Hoare annotation is: true [2018-11-23 08:15:56,618 INFO L448 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 2 7) no Hoare annotation was computed. [2018-11-23 08:15:56,619 INFO L448 ceAbstractionStarter]: For program point L4(line 4) no Hoare annotation was computed. [2018-11-23 08:15:56,619 INFO L448 ceAbstractionStarter]: For program point L3(lines 3 5) no Hoare annotation was computed. [2018-11-23 08:15:56,619 INFO L448 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 4) no Hoare annotation was computed. [2018-11-23 08:15:56,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 08:15:56 BoogieIcfgContainer [2018-11-23 08:15:56,627 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-23 08:15:56,628 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-23 08:15:56,628 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-23 08:15:56,628 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-23 08:15:56,628 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:14:58" (3/4) ... [2018-11-23 08:15:56,630 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-23 08:15:56,634 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-23 08:15:56,634 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-23 08:15:56,634 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-11-23 08:15:56,637 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2018-11-23 08:15:56,637 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2018-11-23 08:15:56,637 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-23 08:15:56,664 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_f176cc56-5de5-46a9-b703-71d7ed74e5a6/bin-2019/utaipan/witness.graphml [2018-11-23 08:15:56,664 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-23 08:15:56,664 INFO L168 Benchmark]: Toolchain (without parser) took 58841.79 ms. Allocated memory was 1.0 GB in the beginning and 1.5 GB in the end (delta: 460.8 MB). Free memory was 959.1 MB in the beginning and 1.1 GB in the end (delta: -145.9 MB). Peak memory consumption was 314.9 MB. Max. memory is 11.5 GB. [2018-11-23 08:15:56,665 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 08:15:56,665 INFO L168 Benchmark]: CACSL2BoogieTranslator took 147.63 ms. Allocated memory is still 1.0 GB. Free memory was 959.1 MB in the beginning and 948.4 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-23 08:15:56,665 INFO L168 Benchmark]: Boogie Procedure Inliner took 17.41 ms. Allocated memory is still 1.0 GB. Free memory is still 948.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 08:15:56,666 INFO L168 Benchmark]: Boogie Preprocessor took 18.41 ms. Allocated memory is still 1.0 GB. Free memory is still 945.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 08:15:56,666 INFO L168 Benchmark]: RCFGBuilder took 194.97 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.3 MB). Free memory was 945.7 MB in the beginning and 1.1 GB in the end (delta: -174.7 MB). Peak memory consumption was 14.1 MB. Max. memory is 11.5 GB. [2018-11-23 08:15:56,666 INFO L168 Benchmark]: TraceAbstraction took 58423.97 ms. Allocated memory was 1.2 GB in the beginning and 1.5 GB in the end (delta: 324.5 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 15.4 MB). Peak memory consumption was 339.9 MB. Max. memory is 11.5 GB. [2018-11-23 08:15:56,667 INFO L168 Benchmark]: Witness Printer took 36.39 ms. Allocated memory is still 1.5 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 08:15:56,668 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 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 147.63 ms. Allocated memory is still 1.0 GB. Free memory was 959.1 MB in the beginning and 948.4 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 17.41 ms. Allocated memory is still 1.0 GB. Free memory is still 948.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 18.41 ms. Allocated memory is still 1.0 GB. Free memory is still 945.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 194.97 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.3 MB). Free memory was 945.7 MB in the beginning and 1.1 GB in the end (delta: -174.7 MB). Peak memory consumption was 14.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 58423.97 ms. Allocated memory was 1.2 GB in the beginning and 1.5 GB in the end (delta: 324.5 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 15.4 MB). Peak memory consumption was 339.9 MB. Max. memory is 11.5 GB. * Witness Printer took 36.39 ms. Allocated memory is still 1.5 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 4]: 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 - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: (x <= 0 && 0 <= x) || ((x + 4294967295) % 4294967296 < 268435455 && x % 4294967296 < 268435455) - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: (x + 4294967295) % 4294967296 < 268435455 || (((0 <= y && x <= 0) && 0 <= x) && y <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. SAFE Result, 58.3s OverallTime, 13 OverallIterations, 110 TraceHistogramMax, 10.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.2s HoareAnnotationTime, HoareTripleCheckerStatistics: 204 SDtfs, 185 SDslu, 1390 SDs, 0 SdLazy, 7954 SolverSat, 517 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2049 GetRequests, 1401 SyntacticMatches, 10 SemanticMatches, 638 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15956 ImplicationChecksByTransitivity, 39.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=154occurred in iteration=12, 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: 0.1s AutomataMinimizationTime, 13 MinimizatonAttempts, 80 StatesRemovedByMinimization, 11 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 20 PreInvPairs, 154 NumberOfFragments, 60 HoareAnnotationTreeSize, 20 FomulaSimplifications, 116628 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 8 FomulaSimplificationsInter, 19 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 13.1s SatisfiabilityAnalysisTime, 33.9s InterpolantComputationTime, 1539 NumberOfCodeBlocks, 1344 NumberOfCodeBlocksAsserted, 59 NumberOfCheckSat, 2262 ConstructedInterpolants, 2 QuantifiedInterpolants, 715372 SizeOfPredicates, 17 NumberOfNonLiveVariables, 1476 ConjunctsInSsa, 166 ConjunctsInUnsatCore, 35 InterpolantComputations, 4 PerfectInterpolantSequences, 41913/61051 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...