./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i5_o5-1.c --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_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i5_o5-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/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 2cc8e2531753efe353b2d0bfa802b879fbc4d745 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 12:41:57,670 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 12:41:57,672 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 12:41:57,709 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 12:41:57,710 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 12:41:57,711 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 12:41:57,712 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 12:41:57,714 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 12:41:57,715 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 12:41:57,716 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 12:41:57,717 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 12:41:57,718 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 12:41:57,718 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 12:41:57,719 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 12:41:57,720 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 12:41:57,721 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 12:41:57,722 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 12:41:57,723 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 12:41:57,725 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 12:41:57,726 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 12:41:57,728 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 12:41:57,729 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 12:41:57,730 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 12:41:57,731 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 12:41:57,734 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 12:41:57,734 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 12:41:57,734 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 12:41:57,735 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 12:41:57,735 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 12:41:57,736 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 12:41:57,737 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 12:41:57,737 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 12:41:57,738 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 12:41:57,738 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 12:41:57,739 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 12:41:57,739 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 12:41:57,740 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 12:41:57,740 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 12:41:57,740 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 12:41:57,741 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 12:41:57,741 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 12:41:57,742 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 12:41:57,758 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 12:41:57,759 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 12:41:57,759 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 12:41:57,759 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 12:41:57,760 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 12:41:57,760 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 12:41:57,760 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 12:41:57,760 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 12:41:57,760 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 12:41:57,760 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 12:41:57,760 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 12:41:57,760 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 12:41:57,761 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 12:41:57,761 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 12:41:57,761 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 12:41:57,761 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 12:41:57,761 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 12:41:57,761 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 12:41:57,762 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 12:41:57,762 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 12:41:57,762 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 12:41:57,762 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 12:41:57,762 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 12:41:57,762 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 12:41:57,762 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 12:41:57,762 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 12:41:57,763 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 12:41:57,763 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 12:41:57,763 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 12:41:57,763 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 12:41:57,763 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 12:41:57,763 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 12:41:57,763 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 12:41:57,763 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 12:41:57,764 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 12:41:57,764 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 12:41:57,764 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 12:41:57,764 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 12:41:57,764 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 12:41:57,764 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_ada7af79-7908-473a-98bf-96411f106b9a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2cc8e2531753efe353b2d0bfa802b879fbc4d745 [2020-12-09 12:41:57,949 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 12:41:57,967 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 12:41:57,969 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 12:41:57,969 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 12:41:57,970 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 12:41:57,971 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_i5_o5-1.c [2020-12-09 12:41:58,011 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/data/f57a7f153/838ee5f1ec0a433ab454705e7affcd3b/FLAG17fdd7a95 [2020-12-09 12:41:58,381 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 12:41:58,381 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/sv-benchmarks/c/recursive-simple/id_i5_o5-1.c [2020-12-09 12:41:58,386 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/data/f57a7f153/838ee5f1ec0a433ab454705e7affcd3b/FLAG17fdd7a95 [2020-12-09 12:41:58,398 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/data/f57a7f153/838ee5f1ec0a433ab454705e7affcd3b [2020-12-09 12:41:58,401 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 12:41:58,402 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 12:41:58,403 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 12:41:58,403 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 12:41:58,406 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 12:41:58,406 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,408 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79b14c52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58, skipping insertion in model container [2020-12-09 12:41:58,408 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,415 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 12:41:58,424 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 12:41:58,526 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_ada7af79-7908-473a-98bf-96411f106b9a/sv-benchmarks/c/recursive-simple/id_i5_o5-1.c[450,463] [2020-12-09 12:41:58,530 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 12:41:58,537 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 12:41:58,549 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_ada7af79-7908-473a-98bf-96411f106b9a/sv-benchmarks/c/recursive-simple/id_i5_o5-1.c[450,463] [2020-12-09 12:41:58,550 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 12:41:58,561 INFO L208 MainTranslator]: Completed translation [2020-12-09 12:41:58,562 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58 WrapperNode [2020-12-09 12:41:58,562 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 12:41:58,563 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 12:41:58,563 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 12:41:58,563 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 12:41:58,569 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,574 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,590 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 12:41:58,590 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 12:41:58,591 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 12:41:58,591 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 12:41:58,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,600 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,601 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,601 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,606 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,607 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... [2020-12-09 12:41:58,608 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 12:41:58,609 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 12:41:58,609 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 12:41:58,610 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 12:41:58,611 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/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 12:41:58,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 12:41:58,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 12:41:58,673 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 12:41:58,673 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-12-09 12:41:58,673 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-12-09 12:41:58,673 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 12:41:58,834 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 12:41:58,835 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-09 12:41:58,837 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 12:41:58 BoogieIcfgContainer [2020-12-09 12:41:58,837 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 12:41:58,839 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 12:41:58,839 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 12:41:58,842 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 12:41:58,843 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 12:41:58" (1/3) ... [2020-12-09 12:41:58,843 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4676c8eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 12:41:58, skipping insertion in model container [2020-12-09 12:41:58,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 12:41:58" (2/3) ... [2020-12-09 12:41:58,844 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4676c8eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 12:41:58, skipping insertion in model container [2020-12-09 12:41:58,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 12:41:58" (3/3) ... [2020-12-09 12:41:58,846 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i5_o5-1.c [2020-12-09 12:41:58,861 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 12:41:58,863 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 12:41:58,871 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 12:41:58,887 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 12:41:58,887 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 12:41:58,888 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 12:41:58,888 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 12:41:58,888 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 12:41:58,888 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 12:41:58,888 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 12:41:58,888 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 12:41:58,898 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2020-12-09 12:41:58,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-09 12:41:58,902 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 12:41:58,902 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 12:41:58,903 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 12:41:58,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 12:41:58,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2020-12-09 12:41:58,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 12:41:58,917 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507364867] [2020-12-09 12:41:58,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 12:41:59,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 12:41:59,072 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 12:41:59,073 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507364867] [2020-12-09 12:41:59,074 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 12:41:59,074 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 12:41:59,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657988803] [2020-12-09 12:41:59,079 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 12:41:59,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 12:41:59,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 12:41:59,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 12:41:59,097 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 5 states. [2020-12-09 12:41:59,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 12:41:59,138 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-12-09 12:41:59,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 12:41:59,140 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-12-09 12:41:59,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 12:41:59,149 INFO L225 Difference]: With dead ends: 24 [2020-12-09 12:41:59,150 INFO L226 Difference]: Without dead ends: 14 [2020-12-09 12:41:59,153 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 12:41:59,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-09 12:41:59,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-09 12:41:59,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-09 12:41:59,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-12-09 12:41:59,190 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2020-12-09 12:41:59,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 12:41:59,190 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-12-09 12:41:59,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 12:41:59,190 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-12-09 12:41:59,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-09 12:41:59,191 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 12:41:59,191 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 12:41:59,191 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 12:41:59,191 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 12:41:59,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 12:41:59,193 INFO L82 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2020-12-09 12:41:59,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 12:41:59,193 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808399556] [2020-12-09 12:41:59,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 12:41:59,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 12:41:59,263 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 12:41:59,263 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808399556] [2020-12-09 12:41:59,263 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769794965] [2020-12-09 12:41:59,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/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 12:41:59,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 12:41:59,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 12:41:59,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 12:41:59,372 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 12:41:59,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 12:41:59,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 12:41:59,512 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1187620496] [2020-12-09 12:41:59,530 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 12:41:59,531 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 12:41:59,535 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 12:41:59,536 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 12:41:59,536 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2020-12-09 12:41:59,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713605430] [2020-12-09 12:41:59,537 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 12:41:59,538 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 12:41:59,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 12:41:59,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-12-09 12:41:59,538 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 9 states. [2020-12-09 12:41:59,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 12:41:59,572 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2020-12-09 12:41:59,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 12:41:59,572 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2020-12-09 12:41:59,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 12:41:59,573 INFO L225 Difference]: With dead ends: 21 [2020-12-09 12:41:59,573 INFO L226 Difference]: Without dead ends: 17 [2020-12-09 12:41:59,574 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-12-09 12:41:59,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-09 12:41:59,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-09 12:41:59,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 12:41:59,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-12-09 12:41:59,578 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2020-12-09 12:41:59,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 12:41:59,578 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-12-09 12:41:59,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 12:41:59,578 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-12-09 12:41:59,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-09 12:41:59,579 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 12:41:59,579 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 12:41:59,780 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-09 12:41:59,781 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 12:41:59,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 12:41:59,782 INFO L82 PathProgramCache]: Analyzing trace with hash -2123675004, now seen corresponding path program 2 times [2020-12-09 12:41:59,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 12:41:59,784 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101195679] [2020-12-09 12:41:59,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 12:41:59,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 12:41:59,885 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-09 12:41:59,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101195679] [2020-12-09 12:41:59,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [71377383] [2020-12-09 12:41:59,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/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 12:41:59,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-09 12:41:59,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 12:41:59,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-09 12:41:59,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 12:41:59,965 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-09 12:41:59,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 12:42:00,170 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-09 12:42:00,170 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [764024984] [2020-12-09 12:42:00,172 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 12:42:00,172 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 12:42:00,172 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 12:42:00,173 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 12:42:00,173 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2020-12-09 12:42:00,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003330585] [2020-12-09 12:42:00,173 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-09 12:42:00,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 12:42:00,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-09 12:42:00,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-12-09 12:42:00,174 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 11 states. [2020-12-09 12:42:00,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 12:42:00,215 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2020-12-09 12:42:00,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-09 12:42:00,215 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 21 [2020-12-09 12:42:00,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 12:42:00,216 INFO L225 Difference]: With dead ends: 24 [2020-12-09 12:42:00,216 INFO L226 Difference]: Without dead ends: 20 [2020-12-09 12:42:00,216 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-12-09 12:42:00,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-09 12:42:00,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-09 12:42:00,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 12:42:00,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-12-09 12:42:00,219 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 21 [2020-12-09 12:42:00,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 12:42:00,220 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-12-09 12:42:00,220 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-09 12:42:00,220 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-12-09 12:42:00,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-09 12:42:00,220 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 12:42:00,221 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 12:42:00,421 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 12:42:00,422 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 12:42:00,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 12:42:00,424 INFO L82 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 3 times [2020-12-09 12:42:00,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 12:42:00,425 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828952658] [2020-12-09 12:42:00,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 12:42:00,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 12:42:00,589 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-09 12:42:00,590 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828952658] [2020-12-09 12:42:00,590 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1332045528] [2020-12-09 12:42:00,590 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/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 12:42:00,616 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 12:42:00,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 12:42:00,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-09 12:42:00,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 12:42:00,649 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-09 12:42:00,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 12:42:00,966 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-09 12:42:00,967 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2137088764] [2020-12-09 12:42:00,968 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 12:42:00,968 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 12:42:00,969 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 12:42:00,969 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 12:42:00,969 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2020-12-09 12:42:00,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897299298] [2020-12-09 12:42:00,970 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-09 12:42:00,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 12:42:00,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-09 12:42:00,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-12-09 12:42:00,970 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 13 states. [2020-12-09 12:42:01,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 12:42:01,024 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2020-12-09 12:42:01,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 12:42:01,024 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2020-12-09 12:42:01,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 12:42:01,025 INFO L225 Difference]: With dead ends: 27 [2020-12-09 12:42:01,025 INFO L226 Difference]: Without dead ends: 23 [2020-12-09 12:42:01,025 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-12-09 12:42:01,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-09 12:42:01,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-12-09 12:42:01,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-09 12:42:01,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-12-09 12:42:01,029 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 27 [2020-12-09 12:42:01,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 12:42:01,029 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-12-09 12:42:01,029 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-09 12:42:01,029 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-12-09 12:42:01,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-09 12:42:01,030 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 12:42:01,030 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 12:42:01,231 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 12:42:01,232 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 12:42:01,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 12:42:01,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1269749436, now seen corresponding path program 4 times [2020-12-09 12:42:01,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 12:42:01,234 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305448200] [2020-12-09 12:42:01,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 12:42:01,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 12:42:01,324 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-12-09 12:42:01,324 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305448200] [2020-12-09 12:42:01,324 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742351516] [2020-12-09 12:42:01,324 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/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 12:42:01,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 12:42:01,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-09 12:42:01,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 12:42:01,393 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-12-09 12:42:01,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 12:42:01,884 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 12:42:01,884 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [150736909] [2020-12-09 12:42:01,886 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 12:42:01,886 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 12:42:01,886 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 12:42:01,886 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 12:42:01,886 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 14 [2020-12-09 12:42:01,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675152126] [2020-12-09 12:42:01,887 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-09 12:42:01,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 12:42:01,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-09 12:42:01,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-12-09 12:42:01,888 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 14 states. [2020-12-09 12:42:01,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 12:42:01,952 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2020-12-09 12:42:01,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-09 12:42:01,953 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2020-12-09 12:42:01,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 12:42:01,953 INFO L225 Difference]: With dead ends: 30 [2020-12-09 12:42:01,953 INFO L226 Difference]: Without dead ends: 26 [2020-12-09 12:42:01,954 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-12-09 12:42:01,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-09 12:42:01,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-12-09 12:42:01,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-09 12:42:01,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-12-09 12:42:01,958 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 33 [2020-12-09 12:42:01,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 12:42:01,958 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-12-09 12:42:01,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-09 12:42:01,958 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-12-09 12:42:01,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-09 12:42:01,959 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 12:42:01,959 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 12:42:02,159 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 12:42:02,160 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 12:42:02,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 12:42:02,160 INFO L82 PathProgramCache]: Analyzing trace with hash -4035634, now seen corresponding path program 5 times [2020-12-09 12:42:02,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 12:42:02,161 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569637587] [2020-12-09 12:42:02,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 12:42:02,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 12:42:02,196 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 12:42:02,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 12:42:02,214 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 12:42:02,231 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 12:42:02,231 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 12:42:02,231 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-12-09 12:42:02,258 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 12:42:02 BoogieIcfgContainer [2020-12-09 12:42:02,258 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 12:42:02,258 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 12:42:02,258 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 12:42:02,258 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 12:42:02,258 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 12:41:58" (3/4) ... [2020-12-09 12:42:02,260 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 12:42:02,291 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_ada7af79-7908-473a-98bf-96411f106b9a/bin/utaipan/witness.graphml [2020-12-09 12:42:02,291 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 12:42:02,292 INFO L168 Benchmark]: Toolchain (without parser) took 3889.79 ms. Allocated memory was 107.0 MB in the beginning and 130.0 MB in the end (delta: 23.1 MB). Free memory was 84.0 MB in the beginning and 66.3 MB in the end (delta: 17.7 MB). Peak memory consumption was 39.1 MB. Max. memory is 16.1 GB. [2020-12-09 12:42:02,293 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 67.1 MB. Free memory is still 42.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 12:42:02,293 INFO L168 Benchmark]: CACSL2BoogieTranslator took 158.97 ms. Allocated memory is still 107.0 MB. Free memory was 84.0 MB in the beginning and 74.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-09 12:42:02,293 INFO L168 Benchmark]: Boogie Procedure Inliner took 27.14 ms. Allocated memory is still 107.0 MB. Free memory was 74.8 MB in the beginning and 73.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 12:42:02,294 INFO L168 Benchmark]: Boogie Preprocessor took 17.99 ms. Allocated memory is still 107.0 MB. Free memory was 73.5 MB in the beginning and 72.7 MB in the end (delta: 810.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 12:42:02,294 INFO L168 Benchmark]: RCFGBuilder took 227.81 ms. Allocated memory is still 107.0 MB. Free memory was 72.7 MB in the beginning and 79.4 MB in the end (delta: -6.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-09 12:42:02,295 INFO L168 Benchmark]: TraceAbstraction took 3418.87 ms. Allocated memory was 107.0 MB in the beginning and 130.0 MB in the end (delta: 23.1 MB). Free memory was 78.8 MB in the beginning and 69.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 35.5 MB. Max. memory is 16.1 GB. [2020-12-09 12:42:02,295 INFO L168 Benchmark]: Witness Printer took 33.24 ms. Allocated memory is still 130.0 MB. Free memory was 69.4 MB in the beginning and 66.3 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 12:42:02,297 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 67.1 MB. Free memory is still 42.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 158.97 ms. Allocated memory is still 107.0 MB. Free memory was 84.0 MB in the beginning and 74.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 27.14 ms. Allocated memory is still 107.0 MB. Free memory was 74.8 MB in the beginning and 73.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 17.99 ms. Allocated memory is still 107.0 MB. Free memory was 73.5 MB in the beginning and 72.7 MB in the end (delta: 810.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 227.81 ms. Allocated memory is still 107.0 MB. Free memory was 72.7 MB in the beginning and 79.4 MB in the end (delta: -6.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3418.87 ms. Allocated memory was 107.0 MB in the beginning and 130.0 MB in the end (delta: 23.1 MB). Free memory was 78.8 MB in the beginning and 69.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 35.5 MB. Max. memory is 16.1 GB. * Witness Printer took 33.24 ms. Allocated memory is still 130.0 MB. Free memory was 69.4 MB in the beginning and 66.3 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int input = 5; [L13] CALL, EXPR id(input) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] int result = id(input); [L14] COND TRUE result == 5 [L15] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.3s, OverallIterations: 6, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 49 SDtfs, 118 SDslu, 174 SDs, 0 SdLazy, 157 SolverSat, 38 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 243 GetRequests, 185 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=26occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.6s InterpolantComputationTime, 240 NumberOfCodeBlocks, 240 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 284 ConstructedInterpolants, 0 QuantifiedInterpolants, 19472 SizeOfPredicates, 18 NumberOfNonLiveVariables, 352 ConjunctsInSsa, 36 ConjunctsInUnsatCore, 13 InterpolantComputations, 1 PerfectInterpolantSequences, 120/300 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 incorrect! Received shutdown request...