java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AbstractInterpretationC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-11 16:33:29,333 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-11 16:33:29,335 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-11 16:33:29,348 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-11 16:33:29,348 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-11 16:33:29,349 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-11 16:33:29,351 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-11 16:33:29,353 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-11 16:33:29,355 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-11 16:33:29,356 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-11 16:33:29,357 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-11 16:33:29,358 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-11 16:33:29,359 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-11 16:33:29,360 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-11 16:33:29,361 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-11 16:33:29,362 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-11 16:33:29,363 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-11 16:33:29,364 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-11 16:33:29,366 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-11 16:33:29,368 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-11 16:33:29,370 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-11 16:33:29,371 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-11 16:33:29,372 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-11 16:33:29,373 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-11 16:33:29,375 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-11 16:33:29,379 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-11 16:33:29,380 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-11 16:33:29,381 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-11 16:33:29,381 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-11 16:33:29,383 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-11 16:33:29,383 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-11 16:33:29,383 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-11 16:33:29,384 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-11 16:33:29,384 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-11 16:33:29,385 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-11 16:33:29,385 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-11 16:33:29,386 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-11 16:33:29,402 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-11 16:33:29,402 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-11 16:33:29,402 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-11 16:33:29,403 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-11 16:33:29,403 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-11 16:33:29,404 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-11 16:33:29,404 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-11 16:33:29,404 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-11 16:33:29,404 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-11 16:33:29,404 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-11 16:33:29,405 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-11 16:33:29,405 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-11 16:33:29,406 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-11 16:33:29,406 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-11 16:33:29,406 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-11 16:33:29,406 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-11 16:33:29,406 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-11 16:33:29,407 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-11 16:33:29,407 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-11 16:33:29,407 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-11 16:33:29,407 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-11 16:33:29,407 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-11 16:33:29,408 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-11 16:33:29,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-11 16:33:29,408 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-11 16:33:29,408 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-11 16:33:29,408 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-11 16:33:29,409 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-11 16:33:29,409 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-11 16:33:29,409 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-11 16:33:29,438 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-11 16:33:29,452 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-11 16:33:29,456 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-11 16:33:29,457 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-11 16:33:29,458 INFO L275 PluginConnector]: CDTParser initialized [2019-09-11 16:33:29,458 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2019-09-11 16:33:29,525 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0700472d/2bac568badc24b6cb713e1f0b7d8bf51/FLAG4c7601463 [2019-09-11 16:33:29,987 INFO L306 CDTParser]: Found 1 translation units. [2019-09-11 16:33:29,988 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2019-09-11 16:33:29,997 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0700472d/2bac568badc24b6cb713e1f0b7d8bf51/FLAG4c7601463 [2019-09-11 16:33:30,401 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0700472d/2bac568badc24b6cb713e1f0b7d8bf51 [2019-09-11 16:33:30,412 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-11 16:33:30,414 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-11 16:33:30,415 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-11 16:33:30,415 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-11 16:33:30,419 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-11 16:33:30,421 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,425 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@635b5632 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30, skipping insertion in model container [2019-09-11 16:33:30,425 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,434 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-11 16:33:30,455 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-11 16:33:30,710 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-11 16:33:30,717 INFO L188 MainTranslator]: Completed pre-run [2019-09-11 16:33:30,741 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-11 16:33:30,759 INFO L192 MainTranslator]: Completed translation [2019-09-11 16:33:30,759 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30 WrapperNode [2019-09-11 16:33:30,760 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-11 16:33:30,760 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-11 16:33:30,761 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-11 16:33:30,761 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-11 16:33:30,778 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,780 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,928 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,929 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,935 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,938 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,939 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30" (1/1) ... [2019-09-11 16:33:30,942 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-11 16:33:30,942 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-11 16:33:30,942 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-11 16:33:30,943 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-11 16:33:30,944 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.09 04:33:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2019-09-11 16:33:31,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-11 16:33:31,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-11 16:33:31,010 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2019-09-11 16:33:31,011 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-11 16:33:31,011 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-11 16:33:31,011 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-11 16:33:31,011 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2019-09-11 16:33:31,011 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-11 16:33:31,011 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-11 16:33:31,012 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-11 16:33:31,185 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-11 16:33:31,185 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-09-11 16:33:31,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.09 04:33:31 BoogieIcfgContainer [2019-09-11 16:33:31,186 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-11 16:33:31,187 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-09-11 16:33:31,187 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-09-11 16:33:31,188 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-09-11 16:33:31,188 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.09 04:33:31" (1/1) ... [2019-09-11 16:33:31,224 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-11 16:33:32,623 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-11 16:33:32,699 INFO L272 AbstractInterpreter]: Visited 28 different actions 6388 times. Merged at 10 different actions 1218 times. Widened at 1 different actions 75 times. Performed 7657 root evaluator evaluations with a maximum evaluation depth of 4. Performed 7657 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 159 fixpoints after 7 different actions. Largest state had 5 variables. [2019-09-11 16:33:32,699 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-09-11 16:33:32,705 INFO L168 Benchmark]: Toolchain (without parser) took 2287.65 ms. Allocated memory was 142.6 MB in the beginning and 232.8 MB in the end (delta: 90.2 MB). Free memory was 90.5 MB in the beginning and 146.7 MB in the end (delta: -56.2 MB). Peak memory consumption was 34.0 MB. Max. memory is 7.1 GB. [2019-09-11 16:33:32,707 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 142.6 MB. Free memory was 109.0 MB in the beginning and 108.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-11 16:33:32,709 INFO L168 Benchmark]: CACSL2BoogieTranslator took 344.89 ms. Allocated memory is still 142.6 MB. Free memory was 90.0 MB in the beginning and 81.1 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2019-09-11 16:33:32,712 INFO L168 Benchmark]: Boogie Preprocessor took 181.32 ms. Allocated memory was 142.6 MB in the beginning and 203.4 MB in the end (delta: 60.8 MB). Free memory was 81.1 MB in the beginning and 181.7 MB in the end (delta: -100.6 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. [2019-09-11 16:33:32,714 INFO L168 Benchmark]: RCFGBuilder took 244.31 ms. Allocated memory is still 203.4 MB. Free memory was 181.1 MB in the beginning and 170.4 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2019-09-11 16:33:32,716 INFO L168 Benchmark]: Abstract Interpretation took 1512.57 ms. Allocated memory was 203.4 MB in the beginning and 232.8 MB in the end (delta: 29.4 MB). Free memory was 169.8 MB in the beginning and 146.7 MB in the end (delta: 23.1 MB). Peak memory consumption was 52.5 MB. Max. memory is 7.1 GB. [2019-09-11 16:33:32,731 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 142.6 MB. Free memory was 109.0 MB in the beginning and 108.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 344.89 ms. Allocated memory is still 142.6 MB. Free memory was 90.0 MB in the beginning and 81.1 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 181.32 ms. Allocated memory was 142.6 MB in the beginning and 203.4 MB in the end (delta: 60.8 MB). Free memory was 81.1 MB in the beginning and 181.7 MB in the end (delta: -100.6 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 244.31 ms. Allocated memory is still 203.4 MB. Free memory was 181.1 MB in the beginning and 170.4 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 1512.57 ms. Allocated memory was 203.4 MB in the beginning and 232.8 MB in the end (delta: 29.4 MB). Free memory was 169.8 MB in the beginning and 146.7 MB in the end (delta: 23.1 MB). Peak memory consumption was 52.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 27]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: abstract domain could reach this error location. Possible FailurePath: [L24] int x = 7; [L25] CALL, EXPR fibo(x) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) [L25] int result = fibo(x); [L26] COND TRUE result != 13 [L27] __VERIFIER_error() RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...