/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 16:25:36,518 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 16:25:36,522 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 16:25:36,565 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 16:25:36,566 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 16:25:36,574 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 16:25:36,577 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 16:25:36,581 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 16:25:36,584 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 16:25:36,588 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 16:25:36,589 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 16:25:36,590 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 16:25:36,590 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 16:25:36,593 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 16:25:36,596 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 16:25:36,597 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 16:25:36,599 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 16:25:36,600 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 16:25:36,602 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 16:25:36,612 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 16:25:36,614 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 16:25:36,615 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 16:25:36,616 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 16:25:36,617 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 16:25:36,629 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 16:25:36,649 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 16:25:36,650 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 16:25:36,651 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 16:25:36,652 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 16:25:36,668 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 16:25:36,668 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 16:25:36,670 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 16:25:36,670 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 16:25:36,670 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 16:25:36,670 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 16:25:36,670 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 16:25:36,671 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 16:25:36,671 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 16:25:36,671 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 16:25:36,671 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 16:25:36,671 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 16:25:36,672 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 16:25:36,672 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 16:25:36,672 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 16:25:36,672 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 16:25:36,672 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 16:25:36,673 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 16:25:36,673 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 16:25:36,673 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 16:25:36,673 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 16:25:36,673 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 16:25:36,674 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 16:25:37,099 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 16:25:37,122 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 16:25:37,126 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 16:25:37,128 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 16:25:37,129 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 16:25:37,130 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-09-04 16:25:37,219 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f52bb161a/a6bfbe4fb3b241bb9d20fe17d60602d2/FLAG6e2255d50 [2020-09-04 16:25:37,762 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 16:25:37,763 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-09-04 16:25:37,774 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f52bb161a/a6bfbe4fb3b241bb9d20fe17d60602d2/FLAG6e2255d50 [2020-09-04 16:25:38,072 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f52bb161a/a6bfbe4fb3b241bb9d20fe17d60602d2 [2020-09-04 16:25:38,087 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 16:25:38,089 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 16:25:38,092 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 16:25:38,092 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 16:25:38,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 16:25:38,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,101 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d084142 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38, skipping insertion in model container [2020-09-04 16:25:38,102 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,111 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 16:25:38,135 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 16:25:38,335 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:25:38,340 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 16:25:38,358 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:25:38,373 INFO L208 MainTranslator]: Completed translation [2020-09-04 16:25:38,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38 WrapperNode [2020-09-04 16:25:38,374 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 16:25:38,374 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 16:25:38,374 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 16:25:38,375 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 16:25:38,388 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,388 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,393 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,394 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,398 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,400 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,402 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (1/1) ... [2020-09-04 16:25:38,403 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 16:25:38,404 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 16:25:38,404 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 16:25:38,404 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 16:25:38,406 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 16:25:38,566 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 16:25:38,567 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 16:25:38,567 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-09-04 16:25:38,567 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-09-04 16:25:38,567 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 16:25:38,568 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 16:25:38,568 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 16:25:38,568 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-09-04 16:25:38,568 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-09-04 16:25:38,568 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 16:25:38,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 16:25:38,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 16:25:38,821 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 16:25:38,822 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 16:25:38,830 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:25:38 BoogieIcfgContainer [2020-09-04 16:25:38,830 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 16:25:38,849 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 16:25:38,849 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 16:25:38,859 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 16:25:38,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 04:25:38" (1/3) ... [2020-09-04 16:25:38,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e4568c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:25:38, skipping insertion in model container [2020-09-04 16:25:38,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:25:38" (2/3) ... [2020-09-04 16:25:38,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e4568c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:25:38, skipping insertion in model container [2020-09-04 16:25:38,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:25:38" (3/3) ... [2020-09-04 16:25:38,870 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-09-04 16:25:38,896 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 16:25:38,906 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 16:25:38,930 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 16:25:38,969 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 16:25:38,969 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 16:25:38,970 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 16:25:38,970 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 16:25:38,970 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 16:25:38,970 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 16:25:38,970 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 16:25:38,971 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 16:25:38,991 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states. [2020-09-04 16:25:39,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 16:25:39,006 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:25:39,007 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:25:39,008 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:25:39,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:25:39,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1089710179, now seen corresponding path program 1 times [2020-09-04 16:25:39,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:25:39,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688427070] [2020-09-04 16:25:39,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:25:39,101 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:25:39,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:25:39,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:25:39,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,276 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:25:39,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688427070] [2020-09-04 16:25:39,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:25:39,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:25:39,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535537556] [2020-09-04 16:25:39,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:25:39,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:25:39,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:25:39,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:25:39,314 INFO L87 Difference]: Start difference. First operand 45 states. Second operand 5 states. [2020-09-04 16:25:39,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:25:39,485 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2020-09-04 16:25:39,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 16:25:39,488 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-09-04 16:25:39,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:25:39,503 INFO L225 Difference]: With dead ends: 58 [2020-09-04 16:25:39,503 INFO L226 Difference]: Without dead ends: 42 [2020-09-04 16:25:39,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 16:25:39,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-04 16:25:39,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-09-04 16:25:39,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 16:25:39,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-09-04 16:25:39,573 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 16 [2020-09-04 16:25:39,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:25:39,574 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-09-04 16:25:39,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:25:39,574 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-09-04 16:25:39,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-04 16:25:39,577 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:25:39,577 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:25:39,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 16:25:39,578 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:25:39,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:25:39,579 INFO L82 PathProgramCache]: Analyzing trace with hash -653728005, now seen corresponding path program 1 times [2020-09-04 16:25:39,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:25:39,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471918834] [2020-09-04 16:25:39,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:25:39,583 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:25:39,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:25:39,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:25:39,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:25:39,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471918834] [2020-09-04 16:25:39,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:25:39,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:25:39,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800055555] [2020-09-04 16:25:39,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:25:39,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:25:39,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:25:39,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:25:39,664 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 5 states. [2020-09-04 16:25:39,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:25:39,761 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-09-04 16:25:39,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 16:25:39,762 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-09-04 16:25:39,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:25:39,764 INFO L225 Difference]: With dead ends: 50 [2020-09-04 16:25:39,764 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 16:25:39,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 16:25:39,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 16:25:39,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-04 16:25:39,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 16:25:39,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-09-04 16:25:39,782 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 17 [2020-09-04 16:25:39,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:25:39,782 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-09-04 16:25:39,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:25:39,783 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-09-04 16:25:39,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-04 16:25:39,785 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:25:39,785 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:25:39,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 16:25:39,786 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:25:39,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:25:39,787 INFO L82 PathProgramCache]: Analyzing trace with hash -1617834856, now seen corresponding path program 1 times [2020-09-04 16:25:39,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:25:39,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365246344] [2020-09-04 16:25:39,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:25:39,790 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:25:39,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:25:39,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:25:39,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:25:39,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 16:25:39,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:25:39,932 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 16:25:39,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365246344] [2020-09-04 16:25:39,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:25:39,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 16:25:39,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778705773] [2020-09-04 16:25:39,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 16:25:39,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:25:39,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 16:25:39,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-04 16:25:39,935 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 7 states. [2020-09-04 16:25:40,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:25:40,044 INFO L93 Difference]: Finished difference Result 82 states and 102 transitions. [2020-09-04 16:25:40,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 16:25:40,045 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-09-04 16:25:40,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:25:40,047 INFO L225 Difference]: With dead ends: 82 [2020-09-04 16:25:40,047 INFO L226 Difference]: Without dead ends: 46 [2020-09-04 16:25:40,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-09-04 16:25:40,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-04 16:25:40,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-09-04 16:25:40,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-09-04 16:25:40,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2020-09-04 16:25:40,064 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 33 [2020-09-04 16:25:40,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:25:40,065 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2020-09-04 16:25:40,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 16:25:40,065 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2020-09-04 16:25:40,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-04 16:25:40,067 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:25:40,068 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:25:40,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 16:25:40,068 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:25:40,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:25:40,069 INFO L82 PathProgramCache]: Analyzing trace with hash 887160861, now seen corresponding path program 1 times [2020-09-04 16:25:40,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:25:40,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852725020] [2020-09-04 16:25:40,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:25:40,072 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:25:40,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:25:40,091 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:25:40,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:25:40,106 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:25:40,138 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 16:25:40,138 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 16:25:40,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 16:25:40,163 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 04:25:40 BoogieIcfgContainer [2020-09-04 16:25:40,163 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 16:25:40,167 INFO L168 Benchmark]: Toolchain (without parser) took 2076.76 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 103.0 MB in the beginning and 96.4 MB in the end (delta: 6.6 MB). Peak memory consumption was 70.0 MB. Max. memory is 7.1 GB. [2020-09-04 16:25:40,168 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 139.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 16:25:40,169 INFO L168 Benchmark]: CACSL2BoogieTranslator took 282.38 ms. Allocated memory is still 139.5 MB. Free memory was 102.8 MB in the beginning and 92.7 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-09-04 16:25:40,170 INFO L168 Benchmark]: Boogie Preprocessor took 29.28 ms. Allocated memory is still 139.5 MB. Free memory was 92.7 MB in the beginning and 91.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:25:40,171 INFO L168 Benchmark]: RCFGBuilder took 426.27 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 91.2 MB in the beginning and 168.5 MB in the end (delta: -77.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:25:40,172 INFO L168 Benchmark]: TraceAbstraction took 1314.48 ms. Allocated memory is still 202.9 MB. Free memory was 167.8 MB in the beginning and 96.4 MB in the end (delta: 71.4 MB). Peak memory consumption was 71.4 MB. Max. memory is 7.1 GB. [2020-09-04 16:25:40,176 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 139.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 282.38 ms. Allocated memory is still 139.5 MB. Free memory was 102.8 MB in the beginning and 92.7 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.28 ms. Allocated memory is still 139.5 MB. Free memory was 92.7 MB in the beginning and 91.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 426.27 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 91.2 MB in the beginning and 168.5 MB in the end (delta: -77.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1314.48 ms. Allocated memory is still 202.9 MB. Free memory was 167.8 MB in the beginning and 96.4 MB in the end (delta: 71.4 MB). Peak memory consumption was 71.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 2; [L37] CALL, EXPR fibo1(x) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND TRUE n < 1 [L19] return 0; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 1 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 45 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.1s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 126 SDtfs, 72 SDslu, 322 SDs, 0 SdLazy, 106 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=0, 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: No data available, 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...