./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i -s /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a16c5bc7f1ed4f9266e4e27b0a7ec7a93876c12a ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 16:22:24,664 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 16:22:24,665 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 16:22:24,686 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 16:22:24,687 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 16:22:24,688 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 16:22:24,689 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 16:22:24,691 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 16:22:24,692 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 16:22:24,693 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 16:22:24,694 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 16:22:24,695 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 16:22:24,695 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 16:22:24,696 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 16:22:24,697 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 16:22:24,698 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 16:22:24,699 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 16:22:24,699 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 16:22:24,701 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 16:22:24,702 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 16:22:24,704 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 16:22:24,705 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 16:22:24,706 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 16:22:24,707 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 16:22:24,709 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 16:22:24,709 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 16:22:24,710 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 16:22:24,710 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 16:22:24,711 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 16:22:24,712 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 16:22:24,712 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 16:22:24,713 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 16:22:24,713 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 16:22:24,714 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 16:22:24,715 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 16:22:24,715 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 16:22:24,715 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 16:22:24,715 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 16:22:24,716 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 16:22:24,716 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 16:22:24,717 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 16:22:24,717 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 16:22:24,734 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 16:22:24,735 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 16:22:24,735 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 16:22:24,735 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 16:22:24,735 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 16:22:24,736 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 16:22:24,736 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 16:22:24,736 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 16:22:24,736 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 16:22:24,736 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 16:22:24,736 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 16:22:24,736 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 16:22:24,736 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 16:22:24,737 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 16:22:24,737 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 16:22:24,737 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 16:22:24,737 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 16:22:24,737 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 16:22:24,738 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 16:22:24,739 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 16:22:24,739 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 16:22:24,739 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 16:22:24,739 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 16:22:24,739 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 16:22:24,739 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 16:22:24,739 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 16:22:24,740 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 16:22:24,740 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 16:22:24,740 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 16:22:24,740 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 16:22:24,740 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 16:22:24,740 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a16c5bc7f1ed4f9266e4e27b0a7ec7a93876c12a [2020-12-09 16:22:24,910 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 16:22:24,930 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 16:22:24,933 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 16:22:24,934 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 16:22:24,935 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 16:22:24,935 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2020-12-09 16:22:24,976 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/data/6a76d946a/7519034d453d4f29af83fa4b1212ff44/FLAG34c3bca12 [2020-12-09 16:22:25,343 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 16:22:25,343 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2020-12-09 16:22:25,348 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/data/6a76d946a/7519034d453d4f29af83fa4b1212ff44/FLAG34c3bca12 [2020-12-09 16:22:25,357 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/data/6a76d946a/7519034d453d4f29af83fa4b1212ff44 [2020-12-09 16:22:25,359 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 16:22:25,360 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 16:22:25,362 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 16:22:25,362 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 16:22:25,364 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 16:22:25,365 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,366 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53794184 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25, skipping insertion in model container [2020-12-09 16:22:25,366 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,371 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 16:22:25,382 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 16:22:25,477 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/sv-benchmarks/c/loop-invgen/string_concat-noarr.i[893,906] [2020-12-09 16:22:25,485 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 16:22:25,491 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 16:22:25,500 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/sv-benchmarks/c/loop-invgen/string_concat-noarr.i[893,906] [2020-12-09 16:22:25,503 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 16:22:25,513 INFO L208 MainTranslator]: Completed translation [2020-12-09 16:22:25,513 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25 WrapperNode [2020-12-09 16:22:25,513 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 16:22:25,514 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 16:22:25,514 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 16:22:25,514 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 16:22:25,519 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,524 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,536 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 16:22:25,536 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 16:22:25,537 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 16:22:25,537 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 16:22:25,542 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,542 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,543 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,544 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,546 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,548 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,549 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... [2020-12-09 16:22:25,550 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 16:22:25,551 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 16:22:25,551 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 16:22:25,551 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 16:22:25,552 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/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 [2020-12-09 16:22:25,612 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 16:22:25,612 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 16:22:25,612 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 16:22:25,613 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 16:22:25,760 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 16:22:25,760 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-09 16:22:25,762 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 04:22:25 BoogieIcfgContainer [2020-12-09 16:22:25,762 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 16:22:25,763 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 16:22:25,763 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 16:22:25,765 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 16:22:25,766 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 04:22:25" (1/3) ... [2020-12-09 16:22:25,766 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f1edec8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 04:22:25, skipping insertion in model container [2020-12-09 16:22:25,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:22:25" (2/3) ... [2020-12-09 16:22:25,767 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f1edec8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 04:22:25, skipping insertion in model container [2020-12-09 16:22:25,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 04:22:25" (3/3) ... [2020-12-09 16:22:25,768 INFO L111 eAbstractionObserver]: Analyzing ICFG string_concat-noarr.i [2020-12-09 16:22:25,778 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 16:22:25,780 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 16:22:25,787 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 16:22:25,802 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 16:22:25,802 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 16:22:25,802 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 16:22:25,803 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 16:22:25,803 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 16:22:25,803 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 16:22:25,803 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 16:22:25,803 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 16:22:25,811 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2020-12-09 16:22:25,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-09 16:22:25,814 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:22:25,815 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:22:25,815 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:22:25,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:22:25,819 INFO L82 PathProgramCache]: Analyzing trace with hash -2136160120, now seen corresponding path program 1 times [2020-12-09 16:22:25,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:22:25,826 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400371360] [2020-12-09 16:22:25,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:22:25,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:25,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:25,914 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400371360] [2020-12-09 16:22:25,914 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 16:22:25,914 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 16:22:25,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802911243] [2020-12-09 16:22:25,918 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-09 16:22:25,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:22:25,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-09 16:22:25,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 16:22:25,930 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 2 states. [2020-12-09 16:22:25,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:22:25,940 INFO L93 Difference]: Finished difference Result 23 states and 33 transitions. [2020-12-09 16:22:25,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-09 16:22:25,941 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 7 [2020-12-09 16:22:25,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:22:25,947 INFO L225 Difference]: With dead ends: 23 [2020-12-09 16:22:25,947 INFO L226 Difference]: Without dead ends: 10 [2020-12-09 16:22:25,949 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 16:22:25,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-09 16:22:25,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-12-09 16:22:25,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-09 16:22:25,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2020-12-09 16:22:25,969 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2020-12-09 16:22:25,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:22:25,970 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2020-12-09 16:22:25,970 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-09 16:22:25,970 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2020-12-09 16:22:25,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-09 16:22:25,970 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:22:25,970 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:22:25,970 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 16:22:25,971 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:22:25,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:22:25,971 INFO L82 PathProgramCache]: Analyzing trace with hash -698830451, now seen corresponding path program 1 times [2020-12-09 16:22:25,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:22:25,972 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641300538] [2020-12-09 16:22:25,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:22:25,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:26,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:26,034 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641300538] [2020-12-09 16:22:26,034 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 16:22:26,034 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 16:22:26,035 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619218754] [2020-12-09 16:22:26,035 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 16:22:26,036 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:22:26,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 16:22:26,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 16:22:26,037 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 4 states. [2020-12-09 16:22:26,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:22:26,067 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2020-12-09 16:22:26,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 16:22:26,068 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-12-09 16:22:26,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:22:26,068 INFO L225 Difference]: With dead ends: 19 [2020-12-09 16:22:26,068 INFO L226 Difference]: Without dead ends: 15 [2020-12-09 16:22:26,069 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-09 16:22:26,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-09 16:22:26,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 12. [2020-12-09 16:22:26,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-09 16:22:26,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2020-12-09 16:22:26,071 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2020-12-09 16:22:26,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:22:26,071 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2020-12-09 16:22:26,071 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 16:22:26,071 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2020-12-09 16:22:26,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-09 16:22:26,071 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:22:26,072 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:22:26,072 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 16:22:26,072 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:22:26,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:22:26,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1516303384, now seen corresponding path program 1 times [2020-12-09 16:22:26,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:22:26,073 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739993371] [2020-12-09 16:22:26,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:22:26,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:26,110 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:26,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739993371] [2020-12-09 16:22:26,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831508666] [2020-12-09 16:22:26,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:26,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:26,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 16:22:26,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:22:26,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:26,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:22:26,233 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-12-09 16:22:26,261 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:26,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1233689261] [2020-12-09 16:22:26,282 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 16:22:26,282 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:22:26,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:22:26,291 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:22:26,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:22:26,590 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:22:26,937 WARN L197 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-12-09 16:22:27,045 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:22:27,045 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:22:27,045 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2020-12-09 16:22:27,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529105417] [2020-12-09 16:22:27,046 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 16:22:27,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:22:27,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 16:22:27,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2020-12-09 16:22:27,048 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 9 states. [2020-12-09 16:22:27,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:22:27,117 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2020-12-09 16:22:27,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-09 16:22:27,117 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 11 [2020-12-09 16:22:27,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:22:27,118 INFO L225 Difference]: With dead ends: 42 [2020-12-09 16:22:27,118 INFO L226 Difference]: Without dead ends: 34 [2020-12-09 16:22:27,119 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2020-12-09 16:22:27,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-09 16:22:27,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2020-12-09 16:22:27,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-09 16:22:27,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2020-12-09 16:22:27,123 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 11 [2020-12-09 16:22:27,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:22:27,124 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2020-12-09 16:22:27,124 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 16:22:27,124 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2020-12-09 16:22:27,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-09 16:22:27,124 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:22:27,125 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:22:27,325 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-09 16:22:27,327 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:22:27,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:22:27,328 INFO L82 PathProgramCache]: Analyzing trace with hash -206185863, now seen corresponding path program 2 times [2020-12-09 16:22:27,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:22:27,329 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374350369] [2020-12-09 16:22:27,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:22:27,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:27,434 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:27,434 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374350369] [2020-12-09 16:22:27,435 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696626262] [2020-12-09 16:22:27,435 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:27,461 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-09 16:22:27,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 16:22:27,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-09 16:22:27,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:22:27,502 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:27,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:22:27,581 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:27,581 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1517587817] [2020-12-09 16:22:27,583 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 16:22:27,583 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:22:27,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:22:27,583 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:22:27,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:22:27,708 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:22:28,044 WARN L197 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-12-09 16:22:28,150 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:22:28,151 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:22:28,151 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2020-12-09 16:22:28,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988500190] [2020-12-09 16:22:28,151 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-09 16:22:28,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:22:28,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-09 16:22:28,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=337, Unknown=0, NotChecked=0, Total=462 [2020-12-09 16:22:28,152 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 15 states. [2020-12-09 16:22:28,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:22:28,294 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2020-12-09 16:22:28,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-09 16:22:28,295 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 17 [2020-12-09 16:22:28,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:22:28,297 INFO L225 Difference]: With dead ends: 86 [2020-12-09 16:22:28,297 INFO L226 Difference]: Without dead ends: 72 [2020-12-09 16:22:28,298 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=185, Invalid=571, Unknown=0, NotChecked=0, Total=756 [2020-12-09 16:22:28,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-09 16:22:28,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 45. [2020-12-09 16:22:28,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-09 16:22:28,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2020-12-09 16:22:28,304 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 17 [2020-12-09 16:22:28,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:22:28,304 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2020-12-09 16:22:28,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-09 16:22:28,305 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2020-12-09 16:22:28,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-09 16:22:28,306 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:22:28,306 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:22:28,506 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:28,507 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:22:28,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:22:28,508 INFO L82 PathProgramCache]: Analyzing trace with hash 2011837787, now seen corresponding path program 3 times [2020-12-09 16:22:28,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:22:28,509 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308325633] [2020-12-09 16:22:28,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:22:28,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:28,638 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:28,638 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308325633] [2020-12-09 16:22:28,638 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898999495] [2020-12-09 16:22:28,638 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:28,665 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 16:22:28,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 16:22:28,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-09 16:22:28,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:22:28,719 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:28,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:22:28,893 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:28,893 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1859610448] [2020-12-09 16:22:28,894 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 16:22:28,895 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:22:28,895 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:22:28,895 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:22:28,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:22:28,997 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:22:29,324 WARN L197 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-12-09 16:22:29,424 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:22:29,424 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:22:29,424 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2020-12-09 16:22:29,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596572873] [2020-12-09 16:22:29,424 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-09 16:22:29,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:22:29,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-09 16:22:29,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=751, Unknown=0, NotChecked=0, Total=1122 [2020-12-09 16:22:29,425 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand 27 states. [2020-12-09 16:22:29,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:22:29,750 INFO L93 Difference]: Finished difference Result 206 states and 240 transitions. [2020-12-09 16:22:29,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-09 16:22:29,750 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 29 [2020-12-09 16:22:29,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:22:29,752 INFO L225 Difference]: With dead ends: 206 [2020-12-09 16:22:29,752 INFO L226 Difference]: Without dead ends: 180 [2020-12-09 16:22:29,753 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=563, Invalid=1507, Unknown=0, NotChecked=0, Total=2070 [2020-12-09 16:22:29,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-12-09 16:22:29,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 87. [2020-12-09 16:22:29,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-12-09 16:22:29,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 99 transitions. [2020-12-09 16:22:29,766 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 99 transitions. Word has length 29 [2020-12-09 16:22:29,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:22:29,766 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 99 transitions. [2020-12-09 16:22:29,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-09 16:22:29,767 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 99 transitions. [2020-12-09 16:22:29,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-09 16:22:29,768 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:22:29,768 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:22:29,969 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-12-09 16:22:29,970 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:22:29,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:22:29,972 INFO L82 PathProgramCache]: Analyzing trace with hash -1006788065, now seen corresponding path program 4 times [2020-12-09 16:22:29,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:22:29,973 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030826239] [2020-12-09 16:22:29,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:22:30,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:30,271 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:30,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030826239] [2020-12-09 16:22:30,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2080275860] [2020-12-09 16:22:30,272 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:30,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:30,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-09 16:22:30,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:22:30,386 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:30,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:22:30,957 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:30,957 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1063219506] [2020-12-09 16:22:30,959 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 16:22:30,959 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:22:30,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:22:30,959 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:22:30,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:22:31,056 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:22:31,382 WARN L197 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-12-09 16:22:31,504 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:22:31,505 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:22:31,505 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2020-12-09 16:22:31,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804083927] [2020-12-09 16:22:31,505 INFO L461 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-12-09 16:22:31,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:22:31,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-12-09 16:22:31,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1295, Invalid=2011, Unknown=0, NotChecked=0, Total=3306 [2020-12-09 16:22:31,508 INFO L87 Difference]: Start difference. First operand 87 states and 99 transitions. Second operand 51 states. [2020-12-09 16:22:32,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:22:32,387 INFO L93 Difference]: Finished difference Result 554 states and 624 transitions. [2020-12-09 16:22:32,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-12-09 16:22:32,388 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 53 [2020-12-09 16:22:32,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:22:32,390 INFO L225 Difference]: With dead ends: 554 [2020-12-09 16:22:32,390 INFO L226 Difference]: Without dead ends: 504 [2020-12-09 16:22:32,392 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1329 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1967, Invalid=4675, Unknown=0, NotChecked=0, Total=6642 [2020-12-09 16:22:32,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2020-12-09 16:22:32,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 171. [2020-12-09 16:22:32,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2020-12-09 16:22:32,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 195 transitions. [2020-12-09 16:22:32,404 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 195 transitions. Word has length 53 [2020-12-09 16:22:32,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:22:32,404 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 195 transitions. [2020-12-09 16:22:32,404 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-12-09 16:22:32,404 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 195 transitions. [2020-12-09 16:22:32,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-12-09 16:22:32,406 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:22:32,406 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:22:32,607 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:32,607 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:22:32,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:22:32,608 INFO L82 PathProgramCache]: Analyzing trace with hash -923969625, now seen corresponding path program 5 times [2020-12-09 16:22:32,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:22:32,608 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013265196] [2020-12-09 16:22:32,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:22:32,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:33,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:33,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013265196] [2020-12-09 16:22:33,425 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504301550] [2020-12-09 16:22:33,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:33,542 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2020-12-09 16:22:33,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 16:22:33,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 50 conjunts are in the unsatisfiable core [2020-12-09 16:22:33,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:22:33,669 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:33,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:22:35,824 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:35,824 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1588589918] [2020-12-09 16:22:35,826 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 16:22:35,826 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:22:35,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:22:35,826 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:22:35,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:22:35,926 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:22:36,304 WARN L197 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-12-09 16:22:36,457 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:22:36,458 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:22:36,458 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2020-12-09 16:22:36,458 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682130308] [2020-12-09 16:22:36,461 INFO L461 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-12-09 16:22:36,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:22:36,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-12-09 16:22:36,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4871, Invalid=6259, Unknown=0, NotChecked=0, Total=11130 [2020-12-09 16:22:36,465 INFO L87 Difference]: Start difference. First operand 171 states and 195 transitions. Second operand 99 states. [2020-12-09 16:22:39,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:22:39,584 INFO L93 Difference]: Finished difference Result 1682 states and 1824 transitions. [2020-12-09 16:22:39,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2020-12-09 16:22:39,584 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 101 [2020-12-09 16:22:39,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:22:39,590 INFO L225 Difference]: With dead ends: 1682 [2020-12-09 16:22:39,590 INFO L226 Difference]: Without dead ends: 1584 [2020-12-09 16:22:39,597 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 245 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3825 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=7367, Invalid=16195, Unknown=0, NotChecked=0, Total=23562 [2020-12-09 16:22:39,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1584 states. [2020-12-09 16:22:39,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1584 to 339. [2020-12-09 16:22:39,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2020-12-09 16:22:39,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 387 transitions. [2020-12-09 16:22:39,613 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 387 transitions. Word has length 101 [2020-12-09 16:22:39,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:22:39,613 INFO L481 AbstractCegarLoop]: Abstraction has 339 states and 387 transitions. [2020-12-09 16:22:39,613 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-12-09 16:22:39,613 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 387 transitions. [2020-12-09 16:22:39,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2020-12-09 16:22:39,616 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:22:39,616 INFO L422 BasicCegarLoop]: trace histogram [95, 94, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:22:39,817 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:39,818 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:22:39,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:22:39,819 INFO L82 PathProgramCache]: Analyzing trace with hash 283128503, now seen corresponding path program 6 times [2020-12-09 16:22:39,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:22:39,820 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936631397] [2020-12-09 16:22:39,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:22:39,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:22:42,654 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:42,654 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936631397] [2020-12-09 16:22:42,654 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187173410] [2020-12-09 16:22:42,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:22:42,750 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 16:22:42,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 16:22:42,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 796 conjuncts, 98 conjunts are in the unsatisfiable core [2020-12-09 16:22:42,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:22:43,032 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:43,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:22:51,397 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:22:51,397 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1884673477] [2020-12-09 16:22:51,399 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 16:22:51,399 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:22:51,399 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:22:51,399 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:22:51,399 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:22:51,481 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:22:51,940 WARN L197 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-12-09 16:22:52,174 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:22:52,174 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:22:52,174 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 194 [2020-12-09 16:22:52,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28352947] [2020-12-09 16:22:52,175 INFO L461 AbstractCegarLoop]: Interpolant automaton has 195 states [2020-12-09 16:22:52,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:22:52,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 195 interpolants. [2020-12-09 16:22:52,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18935, Invalid=21667, Unknown=0, NotChecked=0, Total=40602 [2020-12-09 16:22:52,182 INFO L87 Difference]: Start difference. First operand 339 states and 387 transitions. Second operand 195 states. [2020-12-09 16:23:13,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:23:13,156 INFO L93 Difference]: Finished difference Result 5666 states and 5952 transitions. [2020-12-09 16:23:13,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2020-12-09 16:23:13,156 INFO L78 Accepts]: Start accepts. Automaton has 195 states. Word has length 197 [2020-12-09 16:23:13,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:23:13,174 INFO L225 Difference]: With dead ends: 5666 [2020-12-09 16:23:13,174 INFO L226 Difference]: Without dead ends: 5472 [2020-12-09 16:23:13,180 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 485 SyntacticMatches, 1 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12273 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=28535, Invalid=59971, Unknown=0, NotChecked=0, Total=88506 [2020-12-09 16:23:13,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5472 states. [2020-12-09 16:23:13,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5472 to 675. [2020-12-09 16:23:13,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 675 states. [2020-12-09 16:23:13,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 675 states to 675 states and 771 transitions. [2020-12-09 16:23:13,206 INFO L78 Accepts]: Start accepts. Automaton has 675 states and 771 transitions. Word has length 197 [2020-12-09 16:23:13,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:23:13,206 INFO L481 AbstractCegarLoop]: Abstraction has 675 states and 771 transitions. [2020-12-09 16:23:13,206 INFO L482 AbstractCegarLoop]: Interpolant automaton has 195 states. [2020-12-09 16:23:13,206 INFO L276 IsEmpty]: Start isEmpty. Operand 675 states and 771 transitions. [2020-12-09 16:23:13,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-12-09 16:23:13,212 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:23:13,213 INFO L422 BasicCegarLoop]: trace histogram [191, 190, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:23:13,413 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:23:13,414 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:23:13,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:23:13,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1869371177, now seen corresponding path program 7 times [2020-12-09 16:23:13,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:23:13,416 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281498339] [2020-12-09 16:23:13,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:23:13,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:23:25,217 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 0 proven. 36290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:23:25,217 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281498339] [2020-12-09 16:23:25,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547337986] [2020-12-09 16:23:25,218 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:23:25,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:23:25,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 1564 conjuncts, 192 conjunts are in the unsatisfiable core [2020-12-09 16:23:25,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:23:49,123 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 36290 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:23:49,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:23:58,383 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 36290 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:23:58,383 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2020-12-09 16:23:58,384 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [193, 193] imperfect sequences [193] total 475 [2020-12-09 16:23:58,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610508147] [2020-12-09 16:23:58,385 INFO L461 AbstractCegarLoop]: Interpolant automaton has 283 states [2020-12-09 16:23:58,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:23:58,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 283 interpolants. [2020-12-09 16:23:58,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58432, Invalid=166718, Unknown=0, NotChecked=0, Total=225150 [2020-12-09 16:23:58,397 INFO L87 Difference]: Start difference. First operand 675 states and 771 transitions. Second operand 283 states. [2020-12-09 16:24:02,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:24:02,908 INFO L93 Difference]: Finished difference Result 27955 states and 28141 transitions. [2020-12-09 16:24:02,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2020-12-09 16:24:02,909 INFO L78 Accepts]: Start accepts. Automaton has 283 states. Word has length 389 [2020-12-09 16:24:02,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:24:02,914 INFO L225 Difference]: With dead ends: 27955 [2020-12-09 16:24:02,914 INFO L226 Difference]: Without dead ends: 1198 [2020-12-09 16:24:02,936 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 969 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 473 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87780 ImplicationChecksByTransitivity, 43.3s TimeCoverageRelationStatistics Valid=58432, Invalid=166718, Unknown=0, NotChecked=0, Total=225150 [2020-12-09 16:24:02,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1198 states. [2020-12-09 16:24:02,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1198 to 1182. [2020-12-09 16:24:02,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1182 states. [2020-12-09 16:24:02,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1182 states to 1182 states and 1190 transitions. [2020-12-09 16:24:02,953 INFO L78 Accepts]: Start accepts. Automaton has 1182 states and 1190 transitions. Word has length 389 [2020-12-09 16:24:02,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:24:02,953 INFO L481 AbstractCegarLoop]: Abstraction has 1182 states and 1190 transitions. [2020-12-09 16:24:02,953 INFO L482 AbstractCegarLoop]: Interpolant automaton has 283 states. [2020-12-09 16:24:02,953 INFO L276 IsEmpty]: Start isEmpty. Operand 1182 states and 1190 transitions. [2020-12-09 16:24:02,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-12-09 16:24:02,959 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:24:02,959 INFO L422 BasicCegarLoop]: trace histogram [100, 99, 92, 91, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:24:03,160 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:24:03,161 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:24:03,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:24:03,162 INFO L82 PathProgramCache]: Analyzing trace with hash 446080741, now seen corresponding path program 1 times [2020-12-09 16:24:03,163 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:24:03,163 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927634207] [2020-12-09 16:24:03,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:24:03,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:24:15,933 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:24:15,933 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927634207] [2020-12-09 16:24:15,933 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577463473] [2020-12-09 16:24:15,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:24:16,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:24:16,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 1382 conjuncts, 194 conjunts are in the unsatisfiable core [2020-12-09 16:24:16,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:24:16,641 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:24:16,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:24:18,529 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:24:18,530 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1999720838] [2020-12-09 16:24:18,531 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2020-12-09 16:24:18,531 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:24:18,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:24:18,531 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:24:18,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:24:18,645 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:24:19,210 WARN L197 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 55 [2020-12-09 16:24:20,171 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:24:20,171 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:24:20,171 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 204 [2020-12-09 16:24:20,171 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218906550] [2020-12-09 16:24:20,172 INFO L461 AbstractCegarLoop]: Interpolant automaton has 205 states [2020-12-09 16:24:20,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:24:20,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2020-12-09 16:24:20,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20536, Invalid=24620, Unknown=0, NotChecked=0, Total=45156 [2020-12-09 16:24:20,175 INFO L87 Difference]: Start difference. First operand 1182 states and 1190 transitions. Second operand 205 states. [2020-12-09 16:24:33,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:24:33,821 INFO L93 Difference]: Finished difference Result 2333 states and 2468 transitions. [2020-12-09 16:24:33,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 211 states. [2020-12-09 16:24:33,822 INFO L78 Accepts]: Start accepts. Automaton has 205 states. Word has length 389 [2020-12-09 16:24:33,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:24:33,823 INFO L225 Difference]: With dead ends: 2333 [2020-12-09 16:24:33,823 INFO L226 Difference]: Without dead ends: 0 [2020-12-09 16:24:33,825 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1367 GetRequests, 1145 SyntacticMatches, 2 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2777 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=20662, Invalid=28400, Unknown=0, NotChecked=0, Total=49062 [2020-12-09 16:24:33,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-09 16:24:33,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-09 16:24:33,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-09 16:24:33,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-09 16:24:33,826 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 389 [2020-12-09 16:24:33,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:24:33,826 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-09 16:24:33,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 205 states. [2020-12-09 16:24:33,826 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-09 16:24:33,826 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-09 16:24:34,026 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2020-12-09 16:24:34,032 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-09 16:24:34,056 INFO L262 CegarLoopResult]: For program point L35-2(lines 34 38) no Hoare annotation was computed. [2020-12-09 16:24:34,056 INFO L262 CegarLoopResult]: For program point L35-3(lines 24 42) no Hoare annotation was computed. [2020-12-09 16:24:34,056 INFO L262 CegarLoopResult]: For program point L19(line 19) no Hoare annotation was computed. [2020-12-09 16:24:34,056 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-09 16:24:34,057 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 19) no Hoare annotation was computed. [2020-12-09 16:24:34,057 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-09 16:24:34,057 INFO L262 CegarLoopResult]: For program point L29(lines 29 31) no Hoare annotation was computed. [2020-12-09 16:24:34,057 INFO L262 CegarLoopResult]: For program point L29-2(lines 28 31) no Hoare annotation was computed. [2020-12-09 16:24:34,058 INFO L262 CegarLoopResult]: For program point L29-3(lines 24 42) no Hoare annotation was computed. [2020-12-09 16:24:34,058 INFO L262 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2020-12-09 16:24:34,058 INFO L265 CegarLoopResult]: At program point L18-2(lines 17 22) the Hoare annotation is: true [2020-12-09 16:24:34,058 INFO L265 CegarLoopResult]: At program point L39(lines 24 42) the Hoare annotation is: true [2020-12-09 16:24:34,059 INFO L262 CegarLoopResult]: For program point L35(lines 35 38) no Hoare annotation was computed. [2020-12-09 16:24:34,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 04:24:34 BoogieIcfgContainer [2020-12-09 16:24:34,078 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 16:24:34,079 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 16:24:34,080 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 16:24:34,080 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 16:24:34,081 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 04:22:25" (3/4) ... [2020-12-09 16:24:34,086 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-09 16:24:34,097 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2020-12-09 16:24:34,097 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-12-09 16:24:34,097 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-12-09 16:24:34,097 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-09 16:24:34,120 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_fac64bd1-4210-458a-a3af-5d814914d92f/bin/utaipan/witness.graphml [2020-12-09 16:24:34,120 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 16:24:34,121 INFO L168 Benchmark]: Toolchain (without parser) took 128760.26 ms. Allocated memory was 102.8 MB in the beginning and 318.8 MB in the end (delta: 216.0 MB). Free memory was 74.1 MB in the beginning and 108.4 MB in the end (delta: -34.3 MB). Peak memory consumption was 184.6 MB. Max. memory is 16.1 GB. [2020-12-09 16:24:34,121 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 102.8 MB. Free memory is still 80.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 16:24:34,121 INFO L168 Benchmark]: CACSL2BoogieTranslator took 151.80 ms. Allocated memory is still 102.8 MB. Free memory was 73.9 MB in the beginning and 64.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-09 16:24:34,122 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.08 ms. Allocated memory is still 102.8 MB. Free memory was 64.2 MB in the beginning and 62.8 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 16:24:34,122 INFO L168 Benchmark]: Boogie Preprocessor took 14.10 ms. Allocated memory is still 102.8 MB. Free memory was 62.8 MB in the beginning and 61.8 MB in the end (delta: 955.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 16:24:34,122 INFO L168 Benchmark]: RCFGBuilder took 210.93 ms. Allocated memory is still 102.8 MB. Free memory was 61.7 MB in the beginning and 72.3 MB in the end (delta: -10.6 MB). Peak memory consumption was 8.9 MB. Max. memory is 16.1 GB. [2020-12-09 16:24:34,122 INFO L168 Benchmark]: TraceAbstraction took 128315.43 ms. Allocated memory was 102.8 MB in the beginning and 318.8 MB in the end (delta: 216.0 MB). Free memory was 71.8 MB in the beginning and 110.5 MB in the end (delta: -38.7 MB). Peak memory consumption was 175.7 MB. Max. memory is 16.1 GB. [2020-12-09 16:24:34,123 INFO L168 Benchmark]: Witness Printer took 40.88 ms. Allocated memory is still 318.8 MB. Free memory was 110.5 MB in the beginning and 108.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 16:24:34,124 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 102.8 MB. Free memory is still 80.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 151.80 ms. Allocated memory is still 102.8 MB. Free memory was 73.9 MB in the beginning and 64.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 22.08 ms. Allocated memory is still 102.8 MB. Free memory was 64.2 MB in the beginning and 62.8 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 14.10 ms. Allocated memory is still 102.8 MB. Free memory was 62.8 MB in the beginning and 61.8 MB in the end (delta: 955.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 210.93 ms. Allocated memory is still 102.8 MB. Free memory was 61.7 MB in the beginning and 72.3 MB in the end (delta: -10.6 MB). Peak memory consumption was 8.9 MB. Max. memory is 16.1 GB. * TraceAbstraction took 128315.43 ms. Allocated memory was 102.8 MB in the beginning and 318.8 MB in the end (delta: 216.0 MB). Free memory was 71.8 MB in the beginning and 110.5 MB in the end (delta: -38.7 MB). Peak memory consumption was 175.7 MB. Max. memory is 16.1 GB. * Witness Printer took 40.88 ms. Allocated memory is still 318.8 MB. Free memory was 110.5 MB in the beginning and 108.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 17]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 13 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 128.2s, OverallIterations: 10, TraceHistogramMax: 191, AutomataDifference: 43.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 253 SDtfs, 32822 SDslu, 1875 SDs, 0 SdLazy, 3864 SolverSat, 12195 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3938 GetRequests, 2619 SyntacticMatches, 8 SemanticMatches, 1311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108799 ImplicationChecksByTransitivity, 84.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1182occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 6524 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 2 LocationsWithAnnotation, 2 PreInvPairs, 4 NumberOfFragments, 2 HoareAnnotationTreeSize, 2 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 2 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 75.3s InterpolantComputationTime, 2388 NumberOfCodeBlocks, 2388 NumberOfCodeBlocksAsserted, 70 NumberOfCheckSat, 3548 ConstructedInterpolants, 0 QuantifiedInterpolants, 3307934 SizeOfPredicates, 14 NumberOfNonLiveVariables, 4626 ConjunctsInSsa, 587 ConjunctsInUnsatCore, 26 InterpolantComputations, 4 PerfectInterpolantSequences, 72580/198876 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...