./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.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_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI --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 266436f0336fa87343e9fe2aac074f47fa1a621a ................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 [2021-10-11 02:29:39,397 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-11 02:29:39,400 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-11 02:29:39,448 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-11 02:29:39,449 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-11 02:29:39,454 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-11 02:29:39,457 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-11 02:29:39,461 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-11 02:29:39,464 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-11 02:29:39,468 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-11 02:29:39,469 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-11 02:29:39,470 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-11 02:29:39,474 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-11 02:29:39,479 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-11 02:29:39,482 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-11 02:29:39,484 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-11 02:29:39,486 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-11 02:29:39,491 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-11 02:29:39,493 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-11 02:29:39,500 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-11 02:29:39,503 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-11 02:29:39,504 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-11 02:29:39,508 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-11 02:29:39,509 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-11 02:29:39,520 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-11 02:29:39,521 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-11 02:29:39,521 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-11 02:29:39,524 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-11 02:29:39,524 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-11 02:29:39,526 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-11 02:29:39,526 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-11 02:29:39,527 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-11 02:29:39,529 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-11 02:29:39,531 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-11 02:29:39,532 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-11 02:29:39,532 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-11 02:29:39,533 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-11 02:29:39,534 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-11 02:29:39,534 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-11 02:29:39,535 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-11 02:29:39,536 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-11 02:29:39,538 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-11 02:29:39,578 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-11 02:29:39,578 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-11 02:29:39,580 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-11 02:29:39,580 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-11 02:29:39,581 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-11 02:29:39,581 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-11 02:29:39,581 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-11 02:29:39,581 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-11 02:29:39,582 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-11 02:29:39,582 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-11 02:29:39,583 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-11 02:29:39,583 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-11 02:29:39,584 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-11 02:29:39,584 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-11 02:29:39,584 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-11 02:29:39,585 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-11 02:29:39,585 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-11 02:29:39,585 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-11 02:29:39,586 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-11 02:29:39,586 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-11 02:29:39,586 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-11 02:29:39,586 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-11 02:29:39,587 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-11 02:29:39,587 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-11 02:29:39,587 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-11 02:29:39,587 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-11 02:29:39,588 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-11 02:29:39,588 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-11 02:29:39,588 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-11 02:29:39,590 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-11 02:29:39,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:29:39,590 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-11 02:29:39,591 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-11 02:29:39,591 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-11 02:29:39,591 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-11 02:29:39,591 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-11 02:29:39,592 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-11 02:29:39,592 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-11 02:29:39,592 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-11 02:29:39,592 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_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 266436f0336fa87343e9fe2aac074f47fa1a621a [2021-10-11 02:29:39,857 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-11 02:29:39,878 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-11 02:29:39,880 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-11 02:29:39,882 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-11 02:29:39,883 INFO L275 PluginConnector]: CDTParser initialized [2021-10-11 02:29:39,884 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/../../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c [2021-10-11 02:29:39,961 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/data/c03b4cd9f/cb83d60f31a848bbb466f7d571bc6c19/FLAGd533dfe08 [2021-10-11 02:29:40,528 INFO L306 CDTParser]: Found 1 translation units. [2021-10-11 02:29:40,531 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c [2021-10-11 02:29:40,541 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/data/c03b4cd9f/cb83d60f31a848bbb466f7d571bc6c19/FLAGd533dfe08 [2021-10-11 02:29:40,900 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/data/c03b4cd9f/cb83d60f31a848bbb466f7d571bc6c19 [2021-10-11 02:29:40,903 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-11 02:29:40,906 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-11 02:29:40,909 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-11 02:29:40,909 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-11 02:29:40,914 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-11 02:29:40,915 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:29:40" (1/1) ... [2021-10-11 02:29:40,917 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5541cb99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:40, skipping insertion in model container [2021-10-11 02:29:40,917 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:29:40" (1/1) ... [2021-10-11 02:29:40,925 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-11 02:29:40,941 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-11 02:29:41,183 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c[946,959] [2021-10-11 02:29:41,194 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:29:41,206 INFO L203 MainTranslator]: Completed pre-run [2021-10-11 02:29:41,229 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c[946,959] [2021-10-11 02:29:41,230 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:29:41,246 INFO L208 MainTranslator]: Completed translation [2021-10-11 02:29:41,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41 WrapperNode [2021-10-11 02:29:41,248 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-11 02:29:41,250 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-11 02:29:41,250 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-11 02:29:41,250 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-11 02:29:41,259 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,267 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,284 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-11 02:29:41,285 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-11 02:29:41,285 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-11 02:29:41,285 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-11 02:29:41,293 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,294 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,304 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,305 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,313 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,315 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,319 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... [2021-10-11 02:29:41,325 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-11 02:29:41,327 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-11 02:29:41,328 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-11 02:29:41,328 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-11 02:29:41,329 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (1/1) ... No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:29:41,416 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-11 02:29:41,416 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-11 02:29:41,416 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-11 02:29:41,416 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-11 02:29:41,417 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-11 02:29:41,417 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-11 02:29:41,418 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-11 02:29:41,419 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-11 02:29:41,804 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-11 02:29:41,804 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-11 02:29:41,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:29:41 BoogieIcfgContainer [2021-10-11 02:29:41,807 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-11 02:29:41,808 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-11 02:29:41,809 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-11 02:29:41,812 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-11 02:29:41,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 02:29:40" (1/3) ... [2021-10-11 02:29:41,813 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73757b7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:29:41, skipping insertion in model container [2021-10-11 02:29:41,813 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:41" (2/3) ... [2021-10-11 02:29:41,814 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73757b7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:29:41, skipping insertion in model container [2021-10-11 02:29:41,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:29:41" (3/3) ... [2021-10-11 02:29:41,815 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2021-10-11 02:29:41,836 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-11 02:29:41,839 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-10-11 02:29:41,865 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-11 02:29:41,889 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-10-11 02:29:41,889 INFO L378 AbstractCegarLoop]: Hoare is true [2021-10-11 02:29:41,889 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-10-11 02:29:41,889 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-10-11 02:29:41,889 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-10-11 02:29:41,890 INFO L382 AbstractCegarLoop]: Difference is false [2021-10-11 02:29:41,890 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-10-11 02:29:41,890 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-10-11 02:29:41,905 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2021-10-11 02:29:41,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-11 02:29:41,911 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:41,911 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:41,912 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:41,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:41,918 INFO L82 PathProgramCache]: Analyzing trace with hash -389521846, now seen corresponding path program 1 times [2021-10-11 02:29:41,928 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:29:41,929 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120415042] [2021-10-11 02:29:41,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:29:42,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:42,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:29:42,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120415042] [2021-10-11 02:29:42,153 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:29:42,153 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-11 02:29:42,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052494347] [2021-10-11 02:29:42,158 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-10-11 02:29:42,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:29:42,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-11 02:29:42,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-11 02:29:42,175 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2021-10-11 02:29:42,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:42,234 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-10-11 02:29:42,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-11 02:29:42,236 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2021-10-11 02:29:42,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:42,245 INFO L225 Difference]: With dead ends: 36 [2021-10-11 02:29:42,245 INFO L226 Difference]: Without dead ends: 26 [2021-10-11 02:29:42,248 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 [2021-10-11 02:29:42,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-10-11 02:29:42,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-10-11 02:29:42,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-10-11 02:29:42,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-11 02:29:42,289 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2021-10-11 02:29:42,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:42,290 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-11 02:29:42,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-10-11 02:29:42,290 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-11 02:29:42,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-11 02:29:42,292 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:42,292 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:42,293 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-11 02:29:42,293 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:42,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:42,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1524884472, now seen corresponding path program 1 times [2021-10-11 02:29:42,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:29:42,295 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473999490] [2021-10-11 02:29:42,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:29:42,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:42,355 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:29:42,356 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473999490] [2021-10-11 02:29:42,356 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:29:42,356 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-11 02:29:42,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796467454] [2021-10-11 02:29:42,358 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-10-11 02:29:42,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:29:42,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-11 02:29:42,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-11 02:29:42,360 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 5 states. [2021-10-11 02:29:42,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:42,444 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-10-11 02:29:42,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-11 02:29:42,446 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2021-10-11 02:29:42,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:42,447 INFO L225 Difference]: With dead ends: 32 [2021-10-11 02:29:42,447 INFO L226 Difference]: Without dead ends: 28 [2021-10-11 02:29:42,448 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-11 02:29:42,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-10-11 02:29:42,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-10-11 02:29:42,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-10-11 02:29:42,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-11 02:29:42,457 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2021-10-11 02:29:42,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:42,457 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-11 02:29:42,458 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-10-11 02:29:42,458 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-11 02:29:42,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-11 02:29:42,459 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:42,460 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:42,460 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-11 02:29:42,460 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:42,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:42,461 INFO L82 PathProgramCache]: Analyzing trace with hash 741502751, now seen corresponding path program 1 times [2021-10-11 02:29:42,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:29:42,462 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900263446] [2021-10-11 02:29:42,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:29:42,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:42,548 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:42,548 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900263446] [2021-10-11 02:29:42,548 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717750833] [2021-10-11 02:29:42,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:29:42,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:42,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:42,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:42,781 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:42,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:42,963 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:42,963 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [746841528] [2021-10-11 02:29:42,984 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-11 02:29:42,985 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:29:42,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:29:42,995 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:29:42,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:29:43,202 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.TopInputCallSummarizer.summarize(TopInputCallSummarizer.java:67) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretCallReturnSummary(DagInterpreter.java:220) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:207) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) 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) [2021-10-11 02:29:43,204 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:29:43,205 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 11 [2021-10-11 02:29:43,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561493924] [2021-10-11 02:29:43,207 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-10-11 02:29:43,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:29:43,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-11 02:29:43,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-10-11 02:29:43,210 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 11 states. [2021-10-11 02:29:43,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:43,402 INFO L93 Difference]: Finished difference Result 54 states and 74 transitions. [2021-10-11 02:29:43,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-11 02:29:43,403 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2021-10-11 02:29:43,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:43,406 INFO L225 Difference]: With dead ends: 54 [2021-10-11 02:29:43,407 INFO L226 Difference]: Without dead ends: 30 [2021-10-11 02:29:43,409 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-10-11 02:29:43,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-10-11 02:29:43,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-10-11 02:29:43,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-10-11 02:29:43,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-10-11 02:29:43,422 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 22 [2021-10-11 02:29:43,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:43,423 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-10-11 02:29:43,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-10-11 02:29:43,423 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-10-11 02:29:43,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-10-11 02:29:43,427 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:43,428 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:43,643 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-10-11 02:29:43,643 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:43,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:43,644 INFO L82 PathProgramCache]: Analyzing trace with hash 1785876995, now seen corresponding path program 1 times [2021-10-11 02:29:43,644 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:29:43,644 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201952435] [2021-10-11 02:29:43,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:29:43,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-11 02:29:43,665 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-11 02:29:43,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-11 02:29:43,689 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-11 02:29:43,720 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-10-11 02:29:43,720 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-10-11 02:29:43,720 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-10-11 02:29:43,769 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.10 02:29:43 BoogieIcfgContainer [2021-10-11 02:29:43,769 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-11 02:29:43,769 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-11 02:29:43,770 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-11 02:29:43,770 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-11 02:29:43,770 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:29:41" (3/4) ... [2021-10-11 02:29:43,772 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-11 02:29:43,820 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4984db56-509e-492d-9784-e9f52e0ee47b/bin/utaipan-WLngWcDbfI/witness.graphml [2021-10-11 02:29:43,820 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-11 02:29:43,821 INFO L168 Benchmark]: Toolchain (without parser) took 2916.59 ms. Allocated memory was 107.0 MB in the beginning and 136.3 MB in the end (delta: 29.4 MB). Free memory was 74.3 MB in the beginning and 106.5 MB in the end (delta: -32.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:29:43,822 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 107.0 MB. Free memory is still 61.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:29:43,823 INFO L168 Benchmark]: CACSL2BoogieTranslator took 339.47 ms. Allocated memory is still 107.0 MB. Free memory was 74.3 MB in the beginning and 81.9 MB in the end (delta: -7.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:43,823 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.32 ms. Allocated memory is still 107.0 MB. Free memory was 81.9 MB in the beginning and 80.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:43,824 INFO L168 Benchmark]: Boogie Preprocessor took 41.90 ms. Allocated memory is still 107.0 MB. Free memory was 80.8 MB in the beginning and 79.7 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:29:43,824 INFO L168 Benchmark]: RCFGBuilder took 479.67 ms. Allocated memory is still 107.0 MB. Free memory was 79.7 MB in the beginning and 65.1 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:43,825 INFO L168 Benchmark]: TraceAbstraction took 1960.75 ms. Allocated memory was 107.0 MB in the beginning and 136.3 MB in the end (delta: 29.4 MB). Free memory was 64.8 MB in the beginning and 108.6 MB in the end (delta: -43.8 MB). Peak memory consumption was 60.0 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:43,825 INFO L168 Benchmark]: Witness Printer took 50.94 ms. Allocated memory is still 136.3 MB. Free memory was 108.6 MB in the beginning and 106.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:43,835 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 107.0 MB. Free memory is still 61.0 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 339.47 ms. Allocated memory is still 107.0 MB. Free memory was 74.3 MB in the beginning and 81.9 MB in the end (delta: -7.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 34.32 ms. Allocated memory is still 107.0 MB. Free memory was 81.9 MB in the beginning and 80.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 41.90 ms. Allocated memory is still 107.0 MB. Free memory was 80.8 MB in the beginning and 79.7 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 479.67 ms. Allocated memory is still 107.0 MB. Free memory was 79.7 MB in the beginning and 65.1 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1960.75 ms. Allocated memory was 107.0 MB in the beginning and 136.3 MB in the end (delta: 29.4 MB). Free memory was 64.8 MB in the beginning and 108.6 MB in the end (delta: -43.8 MB). Peak memory consumption was 60.0 MB. Max. memory is 16.1 GB. * Witness Printer took 50.94 ms. Allocated memory is still 136.3 MB. Free memory was 108.6 MB in the beginning and 106.5 MB in the end (delta: 2.1 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: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 2; [L39] CALL, EXPR fibo1(x) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) [L39] int result = fibo1(x); [L40] COND TRUE result == 1 [L41] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.8s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 72 SDtfs, 38 SDslu, 229 SDs, 0 SdLazy, 161 SolverSat, 12 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 65 GetRequests, 39 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred in iteration=3, 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, 3 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 86 NumberOfCodeBlocks, 86 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 80 ConstructedInterpolants, 0 QuantifiedInterpolants, 3176 SizeOfPredicates, 3 NumberOfNonLiveVariables, 81 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 5 InterpolantComputations, 2 PerfectInterpolantSequences, 3/12 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...