/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-86f66a4 [2020-07-07 10:56:45,116 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 10:56:45,120 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 10:56:45,139 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-07 10:56:45,139 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-07 10:56:45,141 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-07 10:56:45,143 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-07 10:56:45,153 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-07 10:56:45,156 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-07 10:56:45,160 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-07 10:56:45,162 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-07 10:56:45,164 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-07 10:56:45,164 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-07 10:56:45,166 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-07 10:56:45,168 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-07 10:56:45,169 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-07 10:56:45,171 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-07 10:56:45,172 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-07 10:56:45,173 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-07 10:56:45,178 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-07 10:56:45,183 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-07 10:56:45,186 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-07 10:56:45,187 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-07 10:56:45,188 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-07 10:56:45,191 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-07 10:56:45,191 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-07 10:56:45,191 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-07 10:56:45,194 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-07 10:56:45,195 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-07 10:56:45,197 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-07 10:56:45,197 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-07 10:56:45,198 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-07 10:56:45,199 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-07 10:56:45,200 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-07 10:56:45,201 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-07 10:56:45,201 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-07 10:56:45,202 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-07 10:56:45,202 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-07 10:56:45,202 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-07 10:56:45,203 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-07 10:56:45,205 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-07 10:56:45,205 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-07 10:56:45,244 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 10:56:45,244 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 10:56:45,248 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-07 10:56:45,249 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-07 10:56:45,249 INFO L138 SettingsManager]: * Use SBE=true [2020-07-07 10:56:45,249 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 10:56:45,249 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 10:56:45,250 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 10:56:45,250 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 10:56:45,250 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 10:56:45,250 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 10:56:45,253 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 10:56:45,254 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 10:56:45,254 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 10:56:45,254 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 10:56:45,254 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 10:56:45,254 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 10:56:45,254 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 10:56:45,255 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-07 10:56:45,255 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 10:56:45,255 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 10:56:45,257 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 10:56:45,258 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 10:56:45,258 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-07 10:56:45,260 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-07 10:56:45,260 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-07 10:56:45,261 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-07 10:56:45,261 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 10:56:45,261 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-07 10:56:45,261 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-07-07 10:56:45,579 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 10:56:45,591 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 10:56:45,594 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 10:56:45,596 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 10:56:45,596 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 10:56:45,597 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-07 10:56:45,658 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4723a64ad/d7bda3649f5e4b1794b312d035be247f/FLAGb30f1f795 [2020-07-07 10:56:46,046 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 10:56:46,046 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-07 10:56:46,054 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4723a64ad/d7bda3649f5e4b1794b312d035be247f/FLAGb30f1f795 [2020-07-07 10:56:46,427 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4723a64ad/d7bda3649f5e4b1794b312d035be247f [2020-07-07 10:56:46,438 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 10:56:46,439 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 10:56:46,440 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 10:56:46,440 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 10:56:46,444 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 10:56:46,445 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,448 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4218c642 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46, skipping insertion in model container [2020-07-07 10:56:46,449 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,456 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 10:56:46,472 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 10:56:46,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 10:56:46,645 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 10:56:46,663 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 10:56:46,679 INFO L208 MainTranslator]: Completed translation [2020-07-07 10:56:46,679 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46 WrapperNode [2020-07-07 10:56:46,679 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 10:56:46,680 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 10:56:46,680 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 10:56:46,681 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 10:56:46,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,701 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,701 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,705 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,708 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,709 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (1/1) ... [2020-07-07 10:56:46,710 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 10:56:46,711 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 10:56:46,711 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 10:56:46,711 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 10:56:46,712 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (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 [2020-07-07 10:56:46,851 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 10:56:46,851 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 10:56:46,852 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-07 10:56:46,852 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 10:56:46,852 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 10:56:46,852 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-07 10:56:46,852 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-07 10:56:46,852 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 10:56:46,852 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 10:56:46,852 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 10:56:47,017 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 10:56:47,017 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-07 10:56:47,020 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 10:56:47 BoogieIcfgContainer [2020-07-07 10:56:47,021 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 10:56:47,022 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 10:56:47,022 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 10:56:47,025 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 10:56:47,025 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 10:56:46" (1/3) ... [2020-07-07 10:56:47,025 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24dab786 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 10:56:47, skipping insertion in model container [2020-07-07 10:56:47,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 10:56:46" (2/3) ... [2020-07-07 10:56:47,026 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24dab786 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 10:56:47, skipping insertion in model container [2020-07-07 10:56:47,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 10:56:47" (3/3) ... [2020-07-07 10:56:47,028 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-07-07 10:56:47,036 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-07 10:56:47,042 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 10:56:47,055 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 10:56:47,080 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 10:56:47,080 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 10:56:47,080 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-07 10:56:47,081 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 10:56:47,081 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 10:56:47,081 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 10:56:47,081 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 10:56:47,081 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 10:56:47,100 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-07 10:56:47,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-07 10:56:47,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 10:56:47,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 10:56:47,110 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 10:56:47,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 10:56:47,116 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-07-07 10:56:47,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 10:56:47,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337449377] [2020-07-07 10:56:47,127 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 10:56:47,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 10:56:47,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337449377] [2020-07-07 10:56:47,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 10:56:47,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 10:56:47,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731451931] [2020-07-07 10:56:47,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 10:56:47,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 10:56:47,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 10:56:47,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 10:56:47,375 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-07-07 10:56:47,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 10:56:47,504 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-07 10:56:47,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 10:56:47,506 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-07 10:56:47,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 10:56:47,518 INFO L225 Difference]: With dead ends: 35 [2020-07-07 10:56:47,518 INFO L226 Difference]: Without dead ends: 21 [2020-07-07 10:56:47,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-07 10:56:47,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-07 10:56:47,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-07 10:56:47,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-07 10:56:47,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-07 10:56:47,574 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-07 10:56:47,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 10:56:47,575 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-07 10:56:47,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 10:56:47,575 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-07 10:56:47,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-07 10:56:47,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 10:56:47,578 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 10:56:47,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 10:56:47,579 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 10:56:47,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 10:56:47,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-07-07 10:56:47,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 10:56:47,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92982859] [2020-07-07 10:56:47,580 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 10:56:47,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 10:56:47,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92982859] [2020-07-07 10:56:47,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 10:56:47,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 10:56:47,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472377069] [2020-07-07 10:56:47,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 10:56:47,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 10:56:47,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 10:56:47,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 10:56:47,665 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-07 10:56:47,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 10:56:47,733 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-07 10:56:47,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 10:56:47,734 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-07 10:56:47,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 10:56:47,735 INFO L225 Difference]: With dead ends: 27 [2020-07-07 10:56:47,735 INFO L226 Difference]: Without dead ends: 23 [2020-07-07 10:56:47,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-07 10:56:47,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-07 10:56:47,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-07 10:56:47,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-07 10:56:47,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-07 10:56:47,745 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-07 10:56:47,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 10:56:47,746 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-07 10:56:47,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 10:56:47,746 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-07 10:56:47,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-07 10:56:47,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 10:56:47,748 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 10:56:47,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-07 10:56:47,749 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 10:56:47,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 10:56:47,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-07-07 10:56:47,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 10:56:47,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872284317] [2020-07-07 10:56:47,750 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 10:56:47,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,910 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-07 10:56:47,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872284317] [2020-07-07 10:56:47,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041893705] [2020-07-07 10:56:47,911 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 10:56:47,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:47,956 INFO L264 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-07 10:56:47,963 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 10:56:48,044 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-07 10:56:48,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 10:56:48,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-07 10:56:48,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071766579] [2020-07-07 10:56:48,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-07 10:56:48,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 10:56:48,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-07 10:56:48,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-07-07 10:56:48,048 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-07 10:56:48,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 10:56:48,182 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-07 10:56:48,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-07 10:56:48,183 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-07 10:56:48,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 10:56:48,184 INFO L225 Difference]: With dead ends: 38 [2020-07-07 10:56:48,184 INFO L226 Difference]: Without dead ends: 23 [2020-07-07 10:56:48,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2020-07-07 10:56:48,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-07 10:56:48,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-07 10:56:48,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-07 10:56:48,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-07-07 10:56:48,194 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-07-07 10:56:48,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 10:56:48,195 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-07-07 10:56:48,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-07 10:56:48,195 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-07-07 10:56:48,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-07 10:56:48,197 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 10:56:48,197 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 10:56:48,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-07-07 10:56:48,411 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 10:56:48,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 10:56:48,412 INFO L82 PathProgramCache]: Analyzing trace with hash -624449707, now seen corresponding path program 1 times [2020-07-07 10:56:48,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 10:56:48,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295787797] [2020-07-07 10:56:48,414 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 10:56:48,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:48,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:48,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:48,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:48,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:48,545 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-07 10:56:48,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295787797] [2020-07-07 10:56:48,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637076470] [2020-07-07 10:56:48,546 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2020-07-07 10:56:48,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 10:56:48,576 INFO L264 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-07 10:56:48,579 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 10:56:48,608 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-07 10:56:48,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 10:56:48,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2020-07-07 10:56:48,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452497503] [2020-07-07 10:56:48,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-07 10:56:48,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 10:56:48,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-07 10:56:48,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-07-07 10:56:48,611 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 9 states. [2020-07-07 10:56:48,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 10:56:48,746 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2020-07-07 10:56:48,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-07 10:56:48,747 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-07 10:56:48,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 10:56:48,750 INFO L225 Difference]: With dead ends: 41 [2020-07-07 10:56:48,750 INFO L226 Difference]: Without dead ends: 37 [2020-07-07 10:56:48,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-07-07 10:56:48,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-07 10:56:48,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-07 10:56:48,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-07 10:56:48,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2020-07-07 10:56:48,763 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 27 [2020-07-07 10:56:48,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 10:56:48,763 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2020-07-07 10:56:48,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-07 10:56:48,764 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2020-07-07 10:56:48,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-07 10:56:48,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 10:56:48,766 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 10:56:48,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 10:56:48,981 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 10:56:48,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 10:56:48,982 INFO L82 PathProgramCache]: Analyzing trace with hash -111055954, now seen corresponding path program 2 times [2020-07-07 10:56:48,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 10:56:48,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117319236] [2020-07-07 10:56:48,983 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 10:56:48,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,127 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-07 10:56:49,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117319236] [2020-07-07 10:56:49,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317702343] [2020-07-07 10:56:49,128 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 10:56:49,163 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-07-07 10:56:49,163 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-07 10:56:49,164 INFO L264 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-07 10:56:49,167 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 10:56:49,234 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-07 10:56:49,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 10:56:49,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2020-07-07 10:56:49,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860562446] [2020-07-07 10:56:49,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-07 10:56:49,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 10:56:49,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-07 10:56:49,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-07-07 10:56:49,237 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand 13 states. [2020-07-07 10:56:49,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 10:56:49,462 INFO L93 Difference]: Finished difference Result 71 states and 106 transitions. [2020-07-07 10:56:49,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-07 10:56:49,463 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2020-07-07 10:56:49,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 10:56:49,465 INFO L225 Difference]: With dead ends: 71 [2020-07-07 10:56:49,465 INFO L226 Difference]: Without dead ends: 38 [2020-07-07 10:56:49,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=254, Unknown=0, NotChecked=0, Total=342 [2020-07-07 10:56:49,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-07 10:56:49,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-07 10:56:49,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-07 10:56:49,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-07-07 10:56:49,478 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 40 [2020-07-07 10:56:49,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 10:56:49,478 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-07-07 10:56:49,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-07 10:56:49,479 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-07-07 10:56:49,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-07 10:56:49,482 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 10:56:49,482 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 10:56:49,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 10:56:49,697 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 10:56:49,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 10:56:49,697 INFO L82 PathProgramCache]: Analyzing trace with hash -383842586, now seen corresponding path program 3 times [2020-07-07 10:56:49,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 10:56:49,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791499840] [2020-07-07 10:56:49,699 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 10:56:49,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 10:56:49,949 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-07 10:56:49,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791499840] [2020-07-07 10:56:49,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929252310] [2020-07-07 10:56:49,950 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 10:56:49,986 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-07-07 10:56:49,986 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-07 10:56:49,988 INFO L264 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-07 10:56:49,992 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 10:56:50,047 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2020-07-07 10:56:50,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 10:56:50,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 14 [2020-07-07 10:56:50,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234255326] [2020-07-07 10:56:50,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-07 10:56:50,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 10:56:50,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-07 10:56:50,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2020-07-07 10:56:50,050 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 14 states. [2020-07-07 10:56:50,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 10:56:50,257 INFO L93 Difference]: Finished difference Result 87 states and 126 transitions. [2020-07-07 10:56:50,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-07 10:56:50,258 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-07 10:56:50,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 10:56:50,261 INFO L225 Difference]: With dead ends: 87 [2020-07-07 10:56:50,261 INFO L226 Difference]: Without dead ends: 50 [2020-07-07 10:56:50,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2020-07-07 10:56:50,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-07 10:56:50,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-07 10:56:50,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-07 10:56:50,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 61 transitions. [2020-07-07 10:56:50,273 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 61 transitions. Word has length 68 [2020-07-07 10:56:50,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 10:56:50,274 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 61 transitions. [2020-07-07 10:56:50,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-07 10:56:50,274 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 61 transitions. [2020-07-07 10:56:50,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-07 10:56:50,276 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 10:56:50,277 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 10:56:50,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 10:56:50,492 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 10:56:50,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 10:56:50,492 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 4 times [2020-07-07 10:56:50,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 10:56:50,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690426928] [2020-07-07 10:56:50,493 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 10:56:50,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 10:56:50,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 10:56:50,559 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-07 10:56:50,559 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-07 10:56:50,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-07-07 10:56:50,600 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.07 10:56:50 BoogieIcfgContainer [2020-07-07 10:56:50,600 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-07 10:56:50,603 INFO L168 Benchmark]: Toolchain (without parser) took 4163.01 ms. Allocated memory was 137.9 MB in the beginning and 248.0 MB in the end (delta: 110.1 MB). Free memory was 102.6 MB in the beginning and 144.7 MB in the end (delta: -42.2 MB). Peak memory consumption was 67.9 MB. Max. memory is 7.1 GB. [2020-07-07 10:56:50,604 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-07 10:56:50,605 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.68 ms. Allocated memory is still 137.9 MB. Free memory was 102.1 MB in the beginning and 92.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-07 10:56:50,606 INFO L168 Benchmark]: Boogie Preprocessor took 30.30 ms. Allocated memory is still 137.9 MB. Free memory was 92.8 MB in the beginning and 91.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-07 10:56:50,607 INFO L168 Benchmark]: RCFGBuilder took 309.78 ms. Allocated memory was 137.9 MB in the beginning and 202.4 MB in the end (delta: 64.5 MB). Free memory was 91.4 MB in the beginning and 170.1 MB in the end (delta: -78.7 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-07 10:56:50,607 INFO L168 Benchmark]: TraceAbstraction took 3578.65 ms. Allocated memory was 202.4 MB in the beginning and 248.0 MB in the end (delta: 45.6 MB). Free memory was 169.4 MB in the beginning and 144.7 MB in the end (delta: 24.6 MB). Peak memory consumption was 70.3 MB. Max. memory is 7.1 GB. [2020-07-07 10:56:50,611 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 239.68 ms. Allocated memory is still 137.9 MB. Free memory was 102.1 MB in the beginning and 92.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.30 ms. Allocated memory is still 137.9 MB. Free memory was 92.8 MB in the beginning and 91.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 309.78 ms. Allocated memory was 137.9 MB in the beginning and 202.4 MB in the end (delta: 64.5 MB). Free memory was 91.4 MB in the beginning and 170.1 MB in the end (delta: -78.7 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3578.65 ms. Allocated memory was 202.4 MB in the beginning and 248.0 MB in the end (delta: 45.6 MB). Free memory was 169.4 MB in the beginning and 144.7 MB in the end (delta: 24.6 MB). Peak memory consumption was 70.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 33]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int x = __VERIFIER_nondet_int(); [L29] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L17] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L19] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L17] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L19] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L22] return fibonacci(n-1) + fibonacci(n-2); [L29] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L29] int result = fibonacci(x); [L30] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L33] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.4s, OverallIterations: 7, TraceHistogramMax: 15, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 107 SDtfs, 164 SDslu, 318 SDs, 0 SdLazy, 423 SolverSat, 134 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 277 GetRequests, 215 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=47occurred in iteration=6, 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, 6 MinimizatonAttempts, 5 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 458 NumberOfCodeBlocks, 435 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 339 ConstructedInterpolants, 0 QuantifiedInterpolants, 29807 SizeOfPredicates, 14 NumberOfNonLiveVariables, 326 ConjunctsInSsa, 28 ConjunctsInUnsatCore, 10 InterpolantComputations, 2 PerfectInterpolantSequences, 363/522 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...