./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 ae007674 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2c47a69833f1a958e38c27482b535b2d176258e52297f9899a8926a996c05520 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ae00767 [2021-12-28 00:59:59,432 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-28 00:59:59,435 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-28 00:59:59,478 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-28 00:59:59,479 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-28 00:59:59,482 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-28 00:59:59,483 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-28 00:59:59,488 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-28 00:59:59,491 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-28 00:59:59,496 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-28 00:59:59,497 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-28 00:59:59,501 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-28 00:59:59,502 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-28 00:59:59,504 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-28 00:59:59,505 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-28 00:59:59,509 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-28 00:59:59,509 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-28 00:59:59,510 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-28 00:59:59,512 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-28 00:59:59,517 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-28 00:59:59,519 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-28 00:59:59,520 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-28 00:59:59,520 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-28 00:59:59,521 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-28 00:59:59,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-28 00:59:59,523 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-28 00:59:59,524 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-28 00:59:59,525 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-28 00:59:59,525 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-28 00:59:59,526 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-28 00:59:59,526 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-28 00:59:59,527 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-28 00:59:59,529 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-28 00:59:59,529 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-28 00:59:59,530 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-28 00:59:59,530 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-28 00:59:59,531 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-28 00:59:59,531 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-28 00:59:59,532 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-28 00:59:59,533 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-28 00:59:59,533 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-28 00:59:59,534 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-28 00:59:59,565 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-28 00:59:59,566 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-28 00:59:59,567 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-28 00:59:59,567 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-28 00:59:59,568 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-28 00:59:59,568 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-28 00:59:59,569 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-28 00:59:59,569 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-28 00:59:59,569 INFO L138 SettingsManager]: * Use SBE=true [2021-12-28 00:59:59,569 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-28 00:59:59,570 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-28 00:59:59,570 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-28 00:59:59,571 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-28 00:59:59,571 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-28 00:59:59,571 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-28 00:59:59,571 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-28 00:59:59,571 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-28 00:59:59,571 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-28 00:59:59,572 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-28 00:59:59,572 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-28 00:59:59,572 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-28 00:59:59,572 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-28 00:59:59,572 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-28 00:59:59,573 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-28 00:59:59,573 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-28 00:59:59,573 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-28 00:59:59,582 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-28 00:59:59,583 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-28 00:59:59,583 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-28 00:59:59,583 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-28 00:59:59,583 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-28 00:59:59,583 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-28 00:59:59,584 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-28 00:59:59,584 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2c47a69833f1a958e38c27482b535b2d176258e52297f9899a8926a996c05520 [2021-12-28 00:59:59,863 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-28 00:59:59,883 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-28 00:59:59,885 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-28 00:59:59,885 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-28 00:59:59,886 INFO L275 PluginConnector]: CDTParser initialized [2021-12-28 00:59:59,887 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c [2021-12-28 00:59:59,935 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f90b85e17/f330e29f2ecf4f65a7d469c355ab6deb/FLAG7cd2d8e3d [2021-12-28 01:00:00,367 INFO L306 CDTParser]: Found 1 translation units. [2021-12-28 01:00:00,368 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c [2021-12-28 01:00:00,374 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f90b85e17/f330e29f2ecf4f65a7d469c355ab6deb/FLAG7cd2d8e3d [2021-12-28 01:00:00,390 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f90b85e17/f330e29f2ecf4f65a7d469c355ab6deb [2021-12-28 01:00:00,392 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-28 01:00:00,395 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-28 01:00:00,396 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-28 01:00:00,396 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-28 01:00:00,399 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-28 01:00:00,400 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,401 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ca0212 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00, skipping insertion in model container [2021-12-28 01:00:00,401 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,407 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-28 01:00:00,422 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-28 01:00:00,537 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c[946,959] [2021-12-28 01:00:00,540 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-28 01:00:00,546 INFO L203 MainTranslator]: Completed pre-run [2021-12-28 01:00:00,559 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_2-1.c[946,959] [2021-12-28 01:00:00,560 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-28 01:00:00,570 INFO L208 MainTranslator]: Completed translation [2021-12-28 01:00:00,571 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00 WrapperNode [2021-12-28 01:00:00,571 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-28 01:00:00,572 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-28 01:00:00,572 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-28 01:00:00,573 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-28 01:00:00,604 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,616 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,628 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2021-12-28 01:00:00,629 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-28 01:00:00,629 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-28 01:00:00,629 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-28 01:00:00,630 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-28 01:00:00,636 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,636 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,646 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,646 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,653 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,656 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,657 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,658 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-28 01:00:00,665 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-28 01:00:00,665 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-28 01:00:00,666 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-28 01:00:00,666 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (1/1) ... [2021-12-28 01:00:00,673 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-28 01:00:00,682 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 01:00:00,696 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-28 01:00:00,711 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-28 01:00:00,737 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-28 01:00:00,737 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-28 01:00:00,737 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-12-28 01:00:00,737 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-12-28 01:00:00,737 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-12-28 01:00:00,738 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-12-28 01:00:00,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-28 01:00:00,738 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-28 01:00:00,793 INFO L234 CfgBuilder]: Building ICFG [2021-12-28 01:00:00,795 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-28 01:00:00,910 INFO L275 CfgBuilder]: Performing block encoding [2021-12-28 01:00:00,917 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-28 01:00:00,918 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-28 01:00:00,919 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.12 01:00:00 BoogieIcfgContainer [2021-12-28 01:00:00,920 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-28 01:00:00,921 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-28 01:00:00,921 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-28 01:00:00,924 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-28 01:00:00,924 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.12 01:00:00" (1/3) ... [2021-12-28 01:00:00,925 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f70ef38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.12 01:00:00, skipping insertion in model container [2021-12-28 01:00:00,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.12 01:00:00" (2/3) ... [2021-12-28 01:00:00,926 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f70ef38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.12 01:00:00, skipping insertion in model container [2021-12-28 01:00:00,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.12 01:00:00" (3/3) ... [2021-12-28 01:00:00,928 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2021-12-28 01:00:00,933 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-28 01:00:00,933 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-28 01:00:00,984 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-28 01:00:00,994 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-28 01:00:00,994 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-28 01:00:01,010 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-28 01:00:01,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-28 01:00:01,018 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 01:00:01,019 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 01:00:01,019 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-28 01:00:01,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 01:00:01,033 INFO L85 PathProgramCache]: Analyzing trace with hash 1123300790, now seen corresponding path program 1 times [2021-12-28 01:00:01,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 01:00:01,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416131785] [2021-12-28 01:00:01,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 01:00:01,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 01:00:01,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,209 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 01:00:01,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 01:00:01,235 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 01:00:01,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416131785] [2021-12-28 01:00:01,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1416131785] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 01:00:01,236 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 01:00:01,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-28 01:00:01,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519271474] [2021-12-28 01:00:01,238 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 01:00:01,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-28 01:00:01,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 01:00:01,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-28 01:00:01,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-28 01:00:01,289 INFO L87 Difference]: Start difference. First operand has 29 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-28 01:00:01,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 01:00:01,397 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2021-12-28 01:00:01,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-28 01:00:01,400 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-12-28 01:00:01,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 01:00:01,407 INFO L225 Difference]: With dead ends: 39 [2021-12-28 01:00:01,408 INFO L226 Difference]: Without dead ends: 27 [2021-12-28 01:00:01,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-28 01:00:01,417 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 15 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 01:00:01,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 89 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 01:00:01,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-12-28 01:00:01,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-12-28 01:00:01,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-28 01:00:01,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-12-28 01:00:01,468 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 10 [2021-12-28 01:00:01,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 01:00:01,469 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-12-28 01:00:01,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-28 01:00:01,470 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-12-28 01:00:01,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-28 01:00:01,472 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 01:00:01,472 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 01:00:01,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-28 01:00:01,473 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-28 01:00:01,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 01:00:01,476 INFO L85 PathProgramCache]: Analyzing trace with hash 1177745932, now seen corresponding path program 1 times [2021-12-28 01:00:01,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 01:00:01,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957041100] [2021-12-28 01:00:01,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 01:00:01,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 01:00:01,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 01:00:01,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-28 01:00:01,570 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 01:00:01,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957041100] [2021-12-28 01:00:01,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [957041100] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-28 01:00:01,571 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-28 01:00:01,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-28 01:00:01,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126238572] [2021-12-28 01:00:01,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-28 01:00:01,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-28 01:00:01,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 01:00:01,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-28 01:00:01,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-28 01:00:01,574 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-28 01:00:01,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 01:00:01,611 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-12-28 01:00:01,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-28 01:00:01,611 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-28 01:00:01,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 01:00:01,613 INFO L225 Difference]: With dead ends: 33 [2021-12-28 01:00:01,613 INFO L226 Difference]: Without dead ends: 29 [2021-12-28 01:00:01,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-28 01:00:01,615 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 10 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-28 01:00:01,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 77 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-28 01:00:01,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-12-28 01:00:01,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-12-28 01:00:01,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-28 01:00:01,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-12-28 01:00:01,623 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2021-12-28 01:00:01,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 01:00:01,623 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-12-28 01:00:01,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-28 01:00:01,624 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-12-28 01:00:01,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-28 01:00:01,625 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 01:00:01,625 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 01:00:01,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-28 01:00:01,626 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-28 01:00:01,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 01:00:01,626 INFO L85 PathProgramCache]: Analyzing trace with hash 2110588723, now seen corresponding path program 1 times [2021-12-28 01:00:01,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 01:00:01,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969832787] [2021-12-28 01:00:01,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 01:00:01,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 01:00:01,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-28 01:00:01,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-28 01:00:01,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-28 01:00:01,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,762 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 01:00:01,762 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-28 01:00:01,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969832787] [2021-12-28 01:00:01,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969832787] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-28 01:00:01,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986810234] [2021-12-28 01:00:01,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 01:00:01,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 01:00:01,764 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-28 01:00:01,766 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-28 01:00:01,783 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-28 01:00:01,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-28 01:00:01,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-28 01:00:01,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-28 01:00:01,935 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 01:00:01,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-28 01:00:02,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-28 01:00:02,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986810234] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-28 01:00:02,190 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-28 01:00:02,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-12-28 01:00:02,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060520401] [2021-12-28 01:00:02,190 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-28 01:00:02,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-28 01:00:02,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-28 01:00:02,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-28 01:00:02,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-12-28 01:00:02,199 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 13 states, 10 states have (on average 3.1) internal successors, (31), 13 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-28 01:00:02,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-28 01:00:02,384 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2021-12-28 01:00:02,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-28 01:00:02,385 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 3.1) internal successors, (31), 13 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 7 states have call successors, (7) Word has length 23 [2021-12-28 01:00:02,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-28 01:00:02,386 INFO L225 Difference]: With dead ends: 55 [2021-12-28 01:00:02,386 INFO L226 Difference]: Without dead ends: 31 [2021-12-28 01:00:02,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-12-28 01:00:02,388 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 34 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-28 01:00:02,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 121 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-28 01:00:02,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-12-28 01:00:02,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2021-12-28 01:00:02,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-12-28 01:00:02,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-12-28 01:00:02,396 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 23 [2021-12-28 01:00:02,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-28 01:00:02,396 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-12-28 01:00:02,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 3.1) internal successors, (31), 13 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (7), 2 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-28 01:00:02,397 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-12-28 01:00:02,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-28 01:00:02,398 INFO L506 BasicCegarLoop]: Found error trace [2021-12-28 01:00:02,398 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-28 01:00:02,424 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-28 01:00:02,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-28 01:00:02,621 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-28 01:00:02,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-28 01:00:02,622 INFO L85 PathProgramCache]: Analyzing trace with hash 1277869167, now seen corresponding path program 1 times [2021-12-28 01:00:02,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-28 01:00:02,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37008150] [2021-12-28 01:00:02,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-28 01:00:02,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-28 01:00:02,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-28 01:00:02,635 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-28 01:00:02,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-28 01:00:02,660 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-28 01:00:02,661 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-12-28 01:00:02,662 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-12-28 01:00:02,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-28 01:00:02,666 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2021-12-28 01:00:02,669 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-12-28 01:00:02,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.12 01:00:02 BoogieIcfgContainer [2021-12-28 01:00:02,699 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-12-28 01:00:02,700 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-12-28 01:00:02,700 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-12-28 01:00:02,700 INFO L275 PluginConnector]: Witness Printer initialized [2021-12-28 01:00:02,701 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.12 01:00:00" (3/4) ... [2021-12-28 01:00:02,702 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-12-28 01:00:02,746 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-12-28 01:00:02,746 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-12-28 01:00:02,747 INFO L158 Benchmark]: Toolchain (without parser) took 2352.05ms. Allocated memory was 56.6MB in the beginning and 73.4MB in the end (delta: 16.8MB). Free memory was 35.7MB in the beginning and 45.2MB in the end (delta: -9.6MB). Peak memory consumption was 5.4MB. Max. memory is 16.1GB. [2021-12-28 01:00:02,747 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 56.6MB. Free memory was 38.6MB in the beginning and 38.6MB in the end (delta: 44.5kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-28 01:00:02,748 INFO L158 Benchmark]: CACSL2BoogieTranslator took 175.33ms. Allocated memory is still 56.6MB. Free memory was 35.5MB in the beginning and 25.9MB in the end (delta: 9.6MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-28 01:00:02,748 INFO L158 Benchmark]: Boogie Procedure Inliner took 56.48ms. Allocated memory is still 56.6MB. Free memory was 25.8MB in the beginning and 40.0MB in the end (delta: -14.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-12-28 01:00:02,749 INFO L158 Benchmark]: Boogie Preprocessor took 34.45ms. Allocated memory is still 56.6MB. Free memory was 40.0MB in the beginning and 39.0MB in the end (delta: 994.8kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-28 01:00:02,749 INFO L158 Benchmark]: RCFGBuilder took 255.35ms. Allocated memory is still 56.6MB. Free memory was 39.0MB in the beginning and 30.0MB in the end (delta: 8.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-28 01:00:02,749 INFO L158 Benchmark]: TraceAbstraction took 1778.27ms. Allocated memory was 56.6MB in the beginning and 73.4MB in the end (delta: 16.8MB). Free memory was 29.5MB in the beginning and 46.8MB in the end (delta: -17.3MB). Peak memory consumption was 216.5kB. Max. memory is 16.1GB. [2021-12-28 01:00:02,750 INFO L158 Benchmark]: Witness Printer took 46.35ms. Allocated memory is still 73.4MB. Free memory was 46.8MB in the beginning and 45.2MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-28 01:00:02,752 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 56.6MB. Free memory was 38.6MB in the beginning and 38.6MB in the end (delta: 44.5kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 175.33ms. Allocated memory is still 56.6MB. Free memory was 35.5MB in the beginning and 25.9MB in the end (delta: 9.6MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 56.48ms. Allocated memory is still 56.6MB. Free memory was 25.8MB in the beginning and 40.0MB in the end (delta: -14.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 34.45ms. Allocated memory is still 56.6MB. Free memory was 40.0MB in the beginning and 39.0MB in the end (delta: 994.8kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 255.35ms. Allocated memory is still 56.6MB. Free memory was 39.0MB in the beginning and 30.0MB in the end (delta: 8.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 1778.27ms. Allocated memory was 56.6MB in the beginning and 73.4MB in the end (delta: 16.8MB). Free memory was 29.5MB in the beginning and 46.8MB in the end (delta: -17.3MB). Peak memory consumption was 216.5kB. Max. memory is 16.1GB. * Witness Printer took 46.35ms. Allocated memory is still 73.4MB. Free memory was 46.8MB in the beginning and 45.2MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - 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; VAL [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) VAL [fibo1(x)=1, x=2] [L39] int result = fibo1(x); [L40] COND TRUE result == 1 VAL [result=1, x=2] [L41] reach_error() VAL [result=1, x=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1.7s, OverallIterations: 4, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 70 SdHoareTripleChecker+Valid, 0.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 59 mSDsluCounter, 287 SdHoareTripleChecker+Invalid, 0.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 215 mSDsCounter, 16 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 191 IncrementalHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 16 mSolverCounterUnsat, 72 mSDtfsCounter, 191 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 77 GetRequests, 50 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=0, InterpolantAutomatonStates: 20, 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, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 85 ConstructedInterpolants, 0 QuantifiedInterpolants, 181 SizeOfPredicates, 2 NumberOfNonLiveVariables, 75 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! [2021-12-28 01:00:02,792 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE