./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i10_o10_false-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i10_o10_false-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 0aae719d835771c4602eac7b24cfefa200f147c0 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-09 17:13:07,025 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 17:13:07,026 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 17:13:07,033 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 17:13:07,033 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 17:13:07,034 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 17:13:07,034 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 17:13:07,035 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 17:13:07,036 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 17:13:07,036 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 17:13:07,037 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 17:13:07,037 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 17:13:07,037 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 17:13:07,038 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 17:13:07,038 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 17:13:07,039 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 17:13:07,039 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 17:13:07,040 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 17:13:07,041 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 17:13:07,042 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 17:13:07,042 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 17:13:07,043 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 17:13:07,044 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 17:13:07,044 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 17:13:07,044 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 17:13:07,045 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 17:13:07,045 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 17:13:07,046 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 17:13:07,046 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 17:13:07,046 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 17:13:07,047 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 17:13:07,047 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 17:13:07,047 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 17:13:07,047 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 17:13:07,047 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 17:13:07,048 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 17:13:07,048 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-09 17:13:07,056 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 17:13:07,057 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 17:13:07,057 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 17:13:07,058 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-09 17:13:07,058 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-09 17:13:07,058 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-09 17:13:07,058 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-09 17:13:07,058 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-09 17:13:07,058 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-09 17:13:07,059 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-09 17:13:07,059 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-09 17:13:07,059 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-09 17:13:07,059 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-09 17:13:07,060 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 17:13:07,060 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-09 17:13:07,060 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 17:13:07,060 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-09 17:13:07,060 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 17:13:07,060 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 17:13:07,060 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 17:13:07,061 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 17:13:07,061 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-09 17:13:07,061 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 17:13:07,061 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 17:13:07,061 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 17:13:07,061 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-09 17:13:07,062 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 17:13:07,062 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-09 17:13:07,062 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 17:13:07,062 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 17:13:07,062 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 17:13:07,062 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 17:13:07,062 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-09 17:13:07,063 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 17:13:07,063 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 17:13:07,063 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-09 17:13:07,063 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_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 -> 0aae719d835771c4602eac7b24cfefa200f147c0 [2018-12-09 17:13:07,086 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 17:13:07,094 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 17:13:07,096 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 17:13:07,097 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 17:13:07,097 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 17:13:07,097 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_i10_o10_false-unreach-call_true-termination.c [2018-12-09 17:13:07,134 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/data/970958beb/c1826e38c59c4f468eb243c132e68d72/FLAG744f202d1 [2018-12-09 17:13:07,583 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 17:13:07,583 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/sv-benchmarks/c/recursive-simple/id_i10_o10_false-unreach-call_true-termination.c [2018-12-09 17:13:07,586 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/data/970958beb/c1826e38c59c4f468eb243c132e68d72/FLAG744f202d1 [2018-12-09 17:13:07,595 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/data/970958beb/c1826e38c59c4f468eb243c132e68d72 [2018-12-09 17:13:07,598 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 17:13:07,599 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 17:13:07,599 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 17:13:07,599 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 17:13:07,602 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 17:13:07,602 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,604 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1bb87b0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07, skipping insertion in model container [2018-12-09 17:13:07,604 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,608 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 17:13:07,617 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 17:13:07,710 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 17:13:07,712 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 17:13:07,721 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 17:13:07,729 INFO L195 MainTranslator]: Completed translation [2018-12-09 17:13:07,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07 WrapperNode [2018-12-09 17:13:07,730 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 17:13:07,730 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 17:13:07,730 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 17:13:07,730 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 17:13:07,735 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,738 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,742 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 17:13:07,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 17:13:07,742 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 17:13:07,742 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 17:13:07,748 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,748 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,748 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,749 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,751 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,752 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,753 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... [2018-12-09 17:13:07,753 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 17:13:07,753 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 17:13:07,753 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 17:13:07,754 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 17:13:07,754 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:07,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-09 17:13:07,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-09 17:13:07,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 17:13:07,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 17:13:07,817 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-09 17:13:07,817 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-09 17:13:07,817 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-12-09 17:13:07,817 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-12-09 17:13:07,887 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 17:13:07,887 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-09 17:13:07,887 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:13:07 BoogieIcfgContainer [2018-12-09 17:13:07,887 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 17:13:07,888 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-09 17:13:07,888 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-09 17:13:07,889 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-09 17:13:07,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 05:13:07" (1/3) ... [2018-12-09 17:13:07,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ce78abd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:13:07, skipping insertion in model container [2018-12-09 17:13:07,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:13:07" (2/3) ... [2018-12-09 17:13:07,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ce78abd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:13:07, skipping insertion in model container [2018-12-09 17:13:07,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:13:07" (3/3) ... [2018-12-09 17:13:07,891 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i10_o10_false-unreach-call_true-termination.c [2018-12-09 17:13:07,897 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-09 17:13:07,900 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-09 17:13:07,909 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-09 17:13:07,925 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-09 17:13:07,926 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-09 17:13:07,926 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-09 17:13:07,926 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-09 17:13:07,926 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-09 17:13:07,926 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-09 17:13:07,926 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-09 17:13:07,926 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-09 17:13:07,935 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-12-09 17:13:07,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-09 17:13:07,938 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:07,939 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:07,940 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:07,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:07,943 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-12-09 17:13:07,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:07,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:07,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:13:07,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:07,971 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:07,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:08,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 17:13:08,035 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 17:13:08,035 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 17:13:08,035 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:13:08,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 17:13:08,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 17:13:08,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:13:08,046 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-12-09 17:13:08,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:08,084 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-12-09 17:13:08,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 17:13:08,086 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-09 17:13:08,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:08,091 INFO L225 Difference]: With dead ends: 30 [2018-12-09 17:13:08,091 INFO L226 Difference]: Without dead ends: 18 [2018-12-09 17:13:08,093 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-09 17:13:08,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-09 17:13:08,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-12-09 17:13:08,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-09 17:13:08,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-09 17:13:08,118 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-12-09 17:13:08,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:08,118 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-09 17:13:08,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 17:13:08,118 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-09 17:13:08,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-09 17:13:08,119 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:08,119 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:08,119 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:08,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:08,119 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-12-09 17:13:08,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:08,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:08,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:13:08,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:08,120 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:08,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:08,154 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 17:13:08,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:08,155 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:08,155 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-12-09 17:13:08,156 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-12-09 17:13:08,174 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 17:13:08,174 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 17:13:08,260 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-12-09 17:13:08,261 INFO L272 AbstractInterpreter]: Visited 16 different actions 49 times. Never merged. Widened at 1 different actions 2 times. Performed 105 root evaluator evaluations with a maximum evaluation depth of 3. Performed 105 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-12-09 17:13:08,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:08,266 INFO L401 sIntCurrentIteration]: Generating AbsInt predicates [2018-12-09 17:13:08,294 INFO L227 lantSequenceWeakener]: Weakened 10 states. On average, predicates are now at 58.33% of their original sizes. [2018-12-09 17:13:08,295 INFO L416 sIntCurrentIteration]: Unifying AI predicates [2018-12-09 17:13:08,367 INFO L418 sIntCurrentIteration]: We unified 18 AI predicates to 18 [2018-12-09 17:13:08,368 INFO L427 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-12-09 17:13:08,368 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-09 17:13:08,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [12] imperfect sequences [6] total 16 [2018-12-09 17:13:08,368 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:13:08,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-09 17:13:08,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-09 17:13:08,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-12-09 17:13:08,370 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2018-12-09 17:13:08,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:08,532 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2018-12-09 17:13:08,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-09 17:13:08,532 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2018-12-09 17:13:08,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:08,533 INFO L225 Difference]: With dead ends: 39 [2018-12-09 17:13:08,533 INFO L226 Difference]: Without dead ends: 30 [2018-12-09 17:13:08,534 INFO L631 BasicCegarLoop]: 2 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2018-12-09 17:13:08,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-09 17:13:08,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2018-12-09 17:13:08,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-09 17:13:08,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-12-09 17:13:08,537 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 19 [2018-12-09 17:13:08,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:08,538 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-12-09 17:13:08,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-09 17:13:08,538 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-12-09 17:13:08,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-09 17:13:08,538 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:08,539 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:08,539 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:08,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:08,539 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-12-09 17:13:08,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:08,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:08,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:13:08,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:08,540 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:08,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:08,576 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-09 17:13:08,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:08,576 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:08,576 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:13:08,577 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:13:08,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:08,577 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:08,585 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:13:08,585 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:13:08,596 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-09 17:13:08,596 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:13:08,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:13:08,630 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-09 17:13:08,631 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:13:08,806 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-09 17:13:08,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:13:08,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-12-09 17:13:08,820 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:13:08,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-09 17:13:08,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-09 17:13:08,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-12-09 17:13:08,821 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 7 states. [2018-12-09 17:13:08,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:08,858 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2018-12-09 17:13:08,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-09 17:13:08,858 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-12-09 17:13:08,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:08,859 INFO L225 Difference]: With dead ends: 49 [2018-12-09 17:13:08,859 INFO L226 Difference]: Without dead ends: 39 [2018-12-09 17:13:08,859 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-12-09 17:13:08,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-09 17:13:08,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 30. [2018-12-09 17:13:08,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-09 17:13:08,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-09 17:13:08,863 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2018-12-09 17:13:08,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:08,864 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-09 17:13:08,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-09 17:13:08,864 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-09 17:13:08,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-09 17:13:08,864 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:08,865 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:08,865 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:08,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:08,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-12-09 17:13:08,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:08,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:08,866 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:13:08,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:08,866 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:08,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:08,922 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-09 17:13:08,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:08,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:08,922 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:13:08,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:13:08,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:08,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:08,929 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 17:13:08,929 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 17:13:08,935 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 17:13:08,936 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:13:08,937 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:13:08,995 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-09 17:13:08,995 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:13:09,276 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-09 17:13:09,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:13:09,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 11] total 22 [2018-12-09 17:13:09,290 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:13:09,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-09 17:13:09,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-09 17:13:09,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2018-12-09 17:13:09,291 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2018-12-09 17:13:09,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:09,386 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2018-12-09 17:13:09,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-09 17:13:09,386 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2018-12-09 17:13:09,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:09,387 INFO L225 Difference]: With dead ends: 52 [2018-12-09 17:13:09,387 INFO L226 Difference]: Without dead ends: 42 [2018-12-09 17:13:09,388 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 44 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=651, Unknown=0, NotChecked=0, Total=812 [2018-12-09 17:13:09,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-09 17:13:09,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 33. [2018-12-09 17:13:09,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-09 17:13:09,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-09 17:13:09,391 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 31 [2018-12-09 17:13:09,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:09,392 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-09 17:13:09,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-09 17:13:09,392 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-09 17:13:09,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-09 17:13:09,392 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:09,392 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:09,392 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:09,393 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:09,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-12-09 17:13:09,393 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:09,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:09,393 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:13:09,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:09,394 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:09,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:09,437 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-09 17:13:09,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:09,438 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:09,438 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:13:09,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:13:09,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:09,438 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:09,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:13:09,445 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 17:13:09,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:09,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:13:09,470 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-09 17:13:09,470 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:13:09,842 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-09 17:13:09,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:13:09,857 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-12-09 17:13:09,857 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:13:09,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-09 17:13:09,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-09 17:13:09,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-12-09 17:13:09,858 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 9 states. [2018-12-09 17:13:09,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:09,900 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2018-12-09 17:13:09,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-09 17:13:09,901 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-12-09 17:13:09,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:09,901 INFO L225 Difference]: With dead ends: 55 [2018-12-09 17:13:09,901 INFO L226 Difference]: Without dead ends: 45 [2018-12-09 17:13:09,902 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-12-09 17:13:09,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-09 17:13:09,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2018-12-09 17:13:09,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-09 17:13:09,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-09 17:13:09,905 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 37 [2018-12-09 17:13:09,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:09,905 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-09 17:13:09,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-09 17:13:09,906 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-09 17:13:09,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-09 17:13:09,906 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:09,906 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:09,906 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:09,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:09,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-12-09 17:13:09,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:09,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:09,907 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:13:09,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:09,907 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:09,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:09,986 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-09 17:13:09,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:09,986 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:09,986 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:13:09,986 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:13:09,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:09,986 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:09,992 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:13:09,992 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:13:10,001 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-09 17:13:10,001 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:13:10,003 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:13:10,079 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-09 17:13:10,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:13:10,699 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-09 17:13:10,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:13:10,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 15] total 30 [2018-12-09 17:13:10,714 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:13:10,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-09 17:13:10,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-09 17:13:10,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2018-12-09 17:13:10,715 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 23 states. [2018-12-09 17:13:10,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:10,896 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2018-12-09 17:13:10,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-09 17:13:10,896 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 43 [2018-12-09 17:13:10,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:10,897 INFO L225 Difference]: With dead ends: 58 [2018-12-09 17:13:10,897 INFO L226 Difference]: Without dead ends: 48 [2018-12-09 17:13:10,898 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 60 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=321, Invalid=1319, Unknown=0, NotChecked=0, Total=1640 [2018-12-09 17:13:10,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-09 17:13:10,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2018-12-09 17:13:10,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-09 17:13:10,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-09 17:13:10,902 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 43 [2018-12-09 17:13:10,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:10,902 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-09 17:13:10,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-09 17:13:10,902 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-09 17:13:10,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-09 17:13:10,903 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:10,903 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:10,903 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:10,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:10,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-12-09 17:13:10,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:10,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:10,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:13:10,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:10,904 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:10,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:10,978 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-09 17:13:10,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:10,978 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:10,978 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:13:10,978 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:13:10,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:10,978 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:10,984 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 17:13:10,984 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 17:13:10,991 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 17:13:10,991 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:13:10,992 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:13:11,074 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-09 17:13:11,074 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:13:11,881 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-09 17:13:11,896 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:13:11,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11, 17] total 34 [2018-12-09 17:13:11,896 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:13:11,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-09 17:13:11,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-09 17:13:11,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=964, Unknown=0, NotChecked=0, Total=1122 [2018-12-09 17:13:11,897 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 26 states. [2018-12-09 17:13:12,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:12,065 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2018-12-09 17:13:12,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-09 17:13:12,065 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 49 [2018-12-09 17:13:12,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:12,066 INFO L225 Difference]: With dead ends: 61 [2018-12-09 17:13:12,066 INFO L226 Difference]: Without dead ends: 51 [2018-12-09 17:13:12,067 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 68 SyntacticMatches, 14 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=422, Invalid=1740, Unknown=0, NotChecked=0, Total=2162 [2018-12-09 17:13:12,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-09 17:13:12,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 42. [2018-12-09 17:13:12,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-09 17:13:12,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-09 17:13:12,073 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 49 [2018-12-09 17:13:12,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:12,073 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-09 17:13:12,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-09 17:13:12,073 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-09 17:13:12,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-09 17:13:12,074 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:12,074 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:12,074 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:12,074 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:12,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-12-09 17:13:12,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:12,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:12,075 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:13:12,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:12,076 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:12,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:12,193 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-09 17:13:12,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:12,193 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:12,193 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:13:12,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:13:12,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:12,194 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:12,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:13:12,200 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 17:13:12,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:12,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:13:12,319 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-09 17:13:12,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:13:13,471 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-12-09 17:13:13,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:13:13,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12, 19] total 38 [2018-12-09 17:13:13,486 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:13:13,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-09 17:13:13,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-09 17:13:13,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1211, Unknown=0, NotChecked=0, Total=1406 [2018-12-09 17:13:13,487 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 29 states. [2018-12-09 17:13:13,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:13,681 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2018-12-09 17:13:13,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-09 17:13:13,681 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 55 [2018-12-09 17:13:13,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:13,682 INFO L225 Difference]: With dead ends: 64 [2018-12-09 17:13:13,682 INFO L226 Difference]: Without dead ends: 54 [2018-12-09 17:13:13,683 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 76 SyntacticMatches, 16 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=537, Invalid=2219, Unknown=0, NotChecked=0, Total=2756 [2018-12-09 17:13:13,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-09 17:13:13,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2018-12-09 17:13:13,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-09 17:13:13,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-09 17:13:13,687 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 55 [2018-12-09 17:13:13,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:13,687 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-09 17:13:13,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-09 17:13:13,687 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-09 17:13:13,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-12-09 17:13:13,688 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:13,688 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:13,688 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:13,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:13,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-12-09 17:13:13,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:13,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:13,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:13:13,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:13,689 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:13,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:13,753 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-09 17:13:13,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:13,753 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:13,753 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:13:13,753 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:13:13,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:13,753 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:13,759 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:13:13,759 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:13:13,772 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-09 17:13:13,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:13:13,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:13:13,923 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-09 17:13:13,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:13:15,224 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-09 17:13:15,238 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:13:15,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 21] total 36 [2018-12-09 17:13:15,239 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:13:15,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-09 17:13:15,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-09 17:13:15,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1072, Unknown=0, NotChecked=0, Total=1260 [2018-12-09 17:13:15,239 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 32 states. [2018-12-09 17:13:15,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:15,462 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2018-12-09 17:13:15,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-09 17:13:15,462 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 61 [2018-12-09 17:13:15,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:15,463 INFO L225 Difference]: With dead ends: 67 [2018-12-09 17:13:15,463 INFO L226 Difference]: Without dead ends: 57 [2018-12-09 17:13:15,463 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 93 SyntacticMatches, 15 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=482, Invalid=2274, Unknown=0, NotChecked=0, Total=2756 [2018-12-09 17:13:15,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-09 17:13:15,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 48. [2018-12-09 17:13:15,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-09 17:13:15,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-09 17:13:15,467 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 61 [2018-12-09 17:13:15,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:15,467 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-09 17:13:15,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-09 17:13:15,467 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-09 17:13:15,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-09 17:13:15,467 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:15,467 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:15,468 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:15,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:15,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-12-09 17:13:15,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:15,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:15,468 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:13:15,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:15,468 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:15,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:13:15,545 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-09 17:13:15,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:15,545 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:13:15,545 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:13:15,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:13:15,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:13:15,546 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/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 [2018-12-09 17:13:15,553 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 17:13:15,553 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 17:13:15,561 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 17:13:15,562 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:13:15,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:13:15,571 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-09 17:13:15,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:13:17,514 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-12-09 17:13:17,528 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:13:17,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 24 [2018-12-09 17:13:17,528 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:13:17,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-09 17:13:17,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-09 17:13:17,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2018-12-09 17:13:17,529 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 14 states. [2018-12-09 17:13:17,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:13:17,605 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2018-12-09 17:13:17,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-09 17:13:17,606 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-12-09 17:13:17,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:13:17,606 INFO L225 Difference]: With dead ends: 70 [2018-12-09 17:13:17,606 INFO L226 Difference]: Without dead ends: 60 [2018-12-09 17:13:17,607 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2018-12-09 17:13:17,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-09 17:13:17,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 51. [2018-12-09 17:13:17,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-09 17:13:17,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-09 17:13:17,610 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 67 [2018-12-09 17:13:17,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:13:17,610 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-09 17:13:17,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-09 17:13:17,611 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-09 17:13:17,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-12-09 17:13:17,611 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:13:17,611 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:13:17,611 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:13:17,611 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:13:17,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-12-09 17:13:17,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:13:17,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:17,612 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:13:17,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:13:17,612 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:13:17,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 17:13:17,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 17:13:17,630 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-12-09 17:13:17,644 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 05:13:17 BoogieIcfgContainer [2018-12-09 17:13:17,644 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-09 17:13:17,645 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 17:13:17,645 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 17:13:17,645 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 17:13:17,645 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:13:07" (3/4) ... [2018-12-09 17:13:17,646 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-12-09 17:13:17,672 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_cf48980c-27ec-4505-94ac-e1ff7a9a484c/bin-2019/utaipan/witness.graphml [2018-12-09 17:13:17,672 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 17:13:17,672 INFO L168 Benchmark]: Toolchain (without parser) took 10074.42 ms. Allocated memory was 1.0 GB in the beginning and 1.5 GB in the end (delta: 429.4 MB). Free memory was 953.5 MB in the beginning and 1.1 GB in the end (delta: -123.4 MB). Peak memory consumption was 306.0 MB. Max. memory is 11.5 GB. [2018-12-09 17:13:17,673 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 973.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:13:17,673 INFO L168 Benchmark]: CACSL2BoogieTranslator took 130.45 ms. Allocated memory is still 1.0 GB. Free memory was 953.5 MB in the beginning and 942.7 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-09 17:13:17,674 INFO L168 Benchmark]: Boogie Procedure Inliner took 12.16 ms. Allocated memory is still 1.0 GB. Free memory is still 942.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:13:17,674 INFO L168 Benchmark]: Boogie Preprocessor took 10.93 ms. Allocated memory is still 1.0 GB. Free memory is still 942.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:13:17,674 INFO L168 Benchmark]: RCFGBuilder took 133.92 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 942.7 MB in the beginning and 1.1 GB in the end (delta: -174.4 MB). Peak memory consumption was 13.0 MB. Max. memory is 11.5 GB. [2018-12-09 17:13:17,674 INFO L168 Benchmark]: TraceAbstraction took 9756.80 ms. Allocated memory was 1.2 GB in the beginning and 1.5 GB in the end (delta: 292.6 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 40.2 MB). Peak memory consumption was 332.8 MB. Max. memory is 11.5 GB. [2018-12-09 17:13:17,674 INFO L168 Benchmark]: Witness Printer took 27.29 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. [2018-12-09 17:13:17,675 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 973.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 130.45 ms. Allocated memory is still 1.0 GB. Free memory was 953.5 MB in the beginning and 942.7 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 12.16 ms. Allocated memory is still 1.0 GB. Free memory is still 942.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.93 ms. Allocated memory is still 1.0 GB. Free memory is still 942.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 133.92 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 942.7 MB in the beginning and 1.1 GB in the end (delta: -174.4 MB). Peak memory consumption was 13.0 MB. Max. memory is 11.5 GB. * TraceAbstraction took 9756.80 ms. Allocated memory was 1.2 GB in the beginning and 1.5 GB in the end (delta: 292.6 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 40.2 MB). Peak memory consumption was 332.8 MB. Max. memory is 11.5 GB. * Witness Printer took 27.29 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: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 10; VAL [input=10] [L11] CALL, EXPR id(input) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=10, input=10] [L11] int result = id(input); [L12] COND TRUE result == 10 VAL [input=10, result=10] [L13] __VERIFIER_error() VAL [input=10, result=10] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 9.7s OverallTime, 11 OverallIterations, 11 TraceHistogramMax, 1.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 135 SDtfs, 141 SDslu, 1245 SDs, 0 SdLazy, 732 SolverSat, 55 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 963 GetRequests, 570 SyntacticMatches, 102 SemanticMatches, 291 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2836 ImplicationChecksByTransitivity, 2.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 1 AbstIntStrong, 0.6944444444444444 AbsIntWeakeningRatio, 0.5555555555555556 AbsIntAvgWeakeningVarsNumRemoved, 0.8333333333333334 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 10 MinimizatonAttempts, 74 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 7.7s InterpolantComputationTime, 841 NumberOfCodeBlocks, 820 NumberOfCodeBlocksAsserted, 34 NumberOfCheckSat, 1110 ConstructedInterpolants, 0 QuantifiedInterpolants, 137136 SizeOfPredicates, 51 NumberOfNonLiveVariables, 788 ConjunctsInSsa, 120 ConjunctsInUnsatCore, 26 InterpolantComputations, 1 PerfectInterpolantSequences, 1126/2692 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...