/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:55:23,654 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:55:23,658 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:55:23,676 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:55:23,677 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:55:23,679 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:55:23,681 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:55:23,692 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:55:23,696 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:55:23,698 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:55:23,700 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:55:23,702 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:55:23,703 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:55:23,705 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:55:23,707 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:55:23,708 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:55:23,710 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:55:23,712 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:55:23,713 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:55:23,719 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:55:23,723 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:55:23,727 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:55:23,728 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:55:23,729 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:55:23,731 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:55:23,742 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:55:23,743 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:55:23,744 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:55:23,745 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 [2020-07-21 10:55:23,779 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:55:23,779 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:55:23,781 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:55:23,782 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:55:23,782 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:55:23,782 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:55:23,782 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:55:23,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:55:23,783 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:55:23,783 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:55:23,784 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:55:23,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:55:23,785 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:55:23,785 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:55:23,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:55:23,785 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:55:23,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:55:23,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:55:23,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:55:23,786 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:55:23,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:55:23,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:55:23,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:55:23,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:55:23,787 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:55:23,787 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:55:23,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:23,788 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:55:23,788 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:55:23,788 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 10:55:24,068 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:55:24,092 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:55:24,099 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:55:24,102 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:55:24,104 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:55:24,108 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-07-21 10:55:24,207 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d313749a/83b0138d0b644081baaabab3dcfff610/FLAG4651f0eda [2020-07-21 10:55:24,817 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:55:24,818 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-07-21 10:55:24,828 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d313749a/83b0138d0b644081baaabab3dcfff610/FLAG4651f0eda [2020-07-21 10:55:25,183 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d313749a/83b0138d0b644081baaabab3dcfff610 [2020-07-21 10:55:25,195 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:55:25,198 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:55:25,202 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:55:25,202 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:55:25,206 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:55:25,207 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,211 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@673f49e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25, skipping insertion in model container [2020-07-21 10:55:25,212 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,221 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:55:25,241 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:55:25,435 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:55:25,440 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:55:25,455 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:55:25,467 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:55:25,468 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25 WrapperNode [2020-07-21 10:55:25,468 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:55:25,469 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:55:25,469 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:55:25,469 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:55:25,480 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,480 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,486 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,486 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,586 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,589 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,590 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,592 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:55:25,593 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:55:25,593 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:55:25,593 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:55:25,594 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (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 [2020-07-21 10:55:25,666 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:55:25,666 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:55:25,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 10:55:25,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 10:55:25,666 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:55:25,666 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:55:25,666 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:55:25,667 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 10:55:25,667 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 10:55:25,667 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:55:25,667 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:55:25,667 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:55:25,906 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:55:25,907 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:55:25,914 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:55:25 BoogieIcfgContainer [2020-07-21 10:55:25,914 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:55:25,917 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:55:25,917 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:55:25,923 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:55:25,923 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:55:25" (1/3) ... [2020-07-21 10:55:25,937 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a9a9d02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:55:25, skipping insertion in model container [2020-07-21 10:55:25,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (2/3) ... [2020-07-21 10:55:25,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a9a9d02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:55:25, skipping insertion in model container [2020-07-21 10:55:25,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:55:25" (3/3) ... [2020-07-21 10:55:25,944 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-07-21 10:55:25,959 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:55:25,988 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:55:26,007 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:55:26,042 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:55:26,043 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:55:26,043 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:55:26,043 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:55:26,043 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:55:26,044 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:55:26,044 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:55:26,044 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:55:26,061 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 10:55:26,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 10:55:26,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:26,068 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:55:26,069 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:26,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:26,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 10:55:26,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:26,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479530719] [2020-07-21 10:55:26,083 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:26,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:26,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:55:26,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:26,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:55:26,251 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:55:26,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479530719] [2020-07-21 10:55:26,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:55:26,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:55:26,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032176307] [2020-07-21 10:55:26,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:55:26,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:26,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:55:26,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:55:26,282 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 10:55:26,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:26,412 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 10:55:26,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:55:26,415 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 10:55:26,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:26,424 INFO L225 Difference]: With dead ends: 44 [2020-07-21 10:55:26,424 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 10:55:26,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:55:26,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 10:55:26,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 10:55:26,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 10:55:26,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 10:55:26,481 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 10:55:26,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:26,482 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 10:55:26,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:55:26,482 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 10:55:26,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 10:55:26,485 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:26,485 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:55:26,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:26,701 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:26,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:26,702 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 10:55:26,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:26,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597646983] [2020-07-21 10:55:26,703 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:26,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:26,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:55:26,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:26,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:55:26,789 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:55:26,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597646983] [2020-07-21 10:55:26,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:55:26,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:55:26,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757250217] [2020-07-21 10:55:26,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:55:26,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:26,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:55:26,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:55:26,795 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 10:55:26,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:26,855 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 10:55:26,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:55:26,856 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 10:55:26,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:26,858 INFO L225 Difference]: With dead ends: 36 [2020-07-21 10:55:26,859 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 10:55:26,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:55:26,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 10:55:26,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 10:55:26,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 10:55:26,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 10:55:26,870 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 10:55:26,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:26,870 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 10:55:26,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:55:26,871 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 10:55:26,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 10:55:26,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:26,872 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:55:27,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:27,082 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:27,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:27,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 10:55:27,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:27,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661751755] [2020-07-21 10:55:27,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:27,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:27,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:55:27,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:27,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:55:27,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:55:27,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:27,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:27,507 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:55:27,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661751755] [2020-07-21 10:55:27,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:55:27,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 10:55:27,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252342459] [2020-07-21 10:55:27,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:55:27,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:27,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:55:27,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:55:27,521 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 9 states. [2020-07-21 10:55:27,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:27,697 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 10:55:27,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:55:27,698 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 10:55:27,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:27,700 INFO L225 Difference]: With dead ends: 41 [2020-07-21 10:55:27,700 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 10:55:27,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:55:27,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 10:55:27,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 10:55:27,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 10:55:27,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 10:55:27,712 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 10:55:27,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:27,713 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 10:55:27,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:55:27,713 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 10:55:27,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 10:55:27,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:27,715 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] [2020-07-21 10:55:27,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:27,922 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:27,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:27,923 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 10:55:27,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:27,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827990128] [2020-07-21 10:55:27,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:27,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 10:55:27,955 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 10:55:27,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 10:55:27,964 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 10:55:27,981 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 10:55:27,982 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 10:55:28,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:28,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:55:28 BoogieIcfgContainer [2020-07-21 10:55:28,227 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 10:55:28,230 INFO L168 Benchmark]: Toolchain (without parser) took 3032.76 ms. Allocated memory was 137.4 MB in the beginning and 233.3 MB in the end (delta: 95.9 MB). Free memory was 100.6 MB in the beginning and 182.0 MB in the end (delta: -81.4 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:28,231 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 137.4 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 10:55:28,232 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.80 ms. Allocated memory is still 137.4 MB. Free memory was 100.2 MB in the beginning and 90.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:28,233 INFO L168 Benchmark]: Boogie Preprocessor took 123.13 ms. Allocated memory was 137.4 MB in the beginning and 201.9 MB in the end (delta: 64.5 MB). Free memory was 90.7 MB in the beginning and 181.0 MB in the end (delta: -90.3 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:28,233 INFO L168 Benchmark]: RCFGBuilder took 321.92 ms. Allocated memory is still 201.9 MB. Free memory was 181.0 MB in the beginning and 167.7 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:28,234 INFO L168 Benchmark]: TraceAbstraction took 2310.51 ms. Allocated memory was 201.9 MB in the beginning and 233.3 MB in the end (delta: 31.5 MB). Free memory was 167.0 MB in the beginning and 182.0 MB in the end (delta: -15.0 MB). Peak memory consumption was 16.4 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:28,238 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 137.4 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 266.80 ms. Allocated memory is still 137.4 MB. Free memory was 100.2 MB in the beginning and 90.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 123.13 ms. Allocated memory was 137.4 MB in the beginning and 201.9 MB in the end (delta: 64.5 MB). Free memory was 90.7 MB in the beginning and 181.0 MB in the end (delta: -90.3 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 321.92 ms. Allocated memory is still 201.9 MB. Free memory was 181.0 MB in the beginning and 167.7 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2310.51 ms. Allocated memory was 201.9 MB in the beginning and 233.3 MB in the end (delta: 31.5 MB). Free memory was 167.0 MB in the beginning and 182.0 MB in the end (delta: -15.0 MB). Peak memory consumption was 16.4 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; VAL [x=2] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=1, x=2] [L37] int result = fibo1(x); [L38] COND TRUE result == 1 VAL [result=1, x=2] [L39] __VERIFIER_error() VAL [result=1, x=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.1s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 80 SDtfs, 51 SDslu, 203 SDs, 0 SdLazy, 129 SolverSat, 11 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 80 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 80 NumberOfCodeBlocks, 80 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 75 ConstructedInterpolants, 0 QuantifiedInterpolants, 3389 SizeOfPredicates, 7 NumberOfNonLiveVariables, 124 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 4 InterpolantComputations, 2 PerfectInterpolantSequences, 2/8 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...