./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f470102c Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7a7b79fb8a331a00295fb9ddfb653e17bda3c30d ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.25-f470102 [2019-11-28 17:29:17,298 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-28 17:29:17,300 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-28 17:29:17,313 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-28 17:29:17,314 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-28 17:29:17,315 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-28 17:29:17,317 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-28 17:29:17,319 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-28 17:29:17,321 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-28 17:29:17,322 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-28 17:29:17,323 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-28 17:29:17,324 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-28 17:29:17,325 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-28 17:29:17,326 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-28 17:29:17,327 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-28 17:29:17,329 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-28 17:29:17,330 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-28 17:29:17,333 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-28 17:29:17,335 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-28 17:29:17,337 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-28 17:29:17,343 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-28 17:29:17,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-28 17:29:17,347 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-28 17:29:17,348 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-28 17:29:17,354 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-28 17:29:17,356 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-28 17:29:17,357 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-28 17:29:17,358 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-28 17:29:17,360 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-28 17:29:17,361 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-28 17:29:17,362 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-28 17:29:17,363 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-28 17:29:17,364 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-28 17:29:17,365 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-28 17:29:17,370 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-28 17:29:17,370 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-28 17:29:17,371 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-28 17:29:17,372 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-28 17:29:17,372 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-28 17:29:17,376 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-28 17:29:17,378 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-28 17:29:17,379 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-28 17:29:17,400 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-28 17:29:17,400 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-28 17:29:17,402 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-28 17:29:17,402 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-28 17:29:17,402 INFO L138 SettingsManager]: * Use SBE=true [2019-11-28 17:29:17,403 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-28 17:29:17,403 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-28 17:29:17,403 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-28 17:29:17,404 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-28 17:29:17,404 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-28 17:29:17,404 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-28 17:29:17,404 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-28 17:29:17,405 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-28 17:29:17,405 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-28 17:29:17,405 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-28 17:29:17,406 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-28 17:29:17,406 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-28 17:29:17,406 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-28 17:29:17,407 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-28 17:29:17,407 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-28 17:29:17,407 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-28 17:29:17,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-28 17:29:17,408 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-28 17:29:17,408 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-28 17:29:17,408 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-28 17:29:17,409 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-28 17:29:17,409 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-28 17:29:17,409 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-28 17:29:17,410 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-11-28 17:29:17,410 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7a7b79fb8a331a00295fb9ddfb653e17bda3c30d [2019-11-28 17:29:17,745 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-28 17:29:17,759 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-28 17:29:17,763 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-28 17:29:17,765 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-28 17:29:17,765 INFO L275 PluginConnector]: CDTParser initialized [2019-11-28 17:29:17,766 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2019-11-28 17:29:17,838 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46c7644b4/dc99972e8de14a9c86eaa4747af051e3/FLAGcf6a5da59 [2019-11-28 17:29:18,317 INFO L306 CDTParser]: Found 1 translation units. [2019-11-28 17:29:18,318 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2019-11-28 17:29:18,325 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46c7644b4/dc99972e8de14a9c86eaa4747af051e3/FLAGcf6a5da59 [2019-11-28 17:29:18,706 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46c7644b4/dc99972e8de14a9c86eaa4747af051e3 [2019-11-28 17:29:18,709 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-28 17:29:18,711 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-28 17:29:18,712 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-28 17:29:18,712 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-28 17:29:18,716 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-28 17:29:18,717 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:18,721 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1544dcae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18, skipping insertion in model container [2019-11-28 17:29:18,721 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:18,729 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-28 17:29:18,747 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-28 17:29:18,939 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 17:29:18,946 INFO L203 MainTranslator]: Completed pre-run [2019-11-28 17:29:18,970 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 17:29:18,986 INFO L208 MainTranslator]: Completed translation [2019-11-28 17:29:18,988 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18 WrapperNode [2019-11-28 17:29:18,988 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-28 17:29:18,989 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-28 17:29:18,989 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-28 17:29:18,990 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-28 17:29:18,998 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,003 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,073 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-28 17:29:19,073 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-28 17:29:19,074 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-28 17:29:19,074 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-28 17:29:19,085 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,085 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,086 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,087 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,090 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,092 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,093 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... [2019-11-28 17:29:19,095 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-28 17:29:19,095 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-28 17:29:19,095 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-28 17:29:19,096 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-28 17:29:19,097 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-28 17:29:19,153 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-28 17:29:19,153 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-28 17:29:19,154 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2019-11-28 17:29:19,155 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2019-11-28 17:29:19,155 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2019-11-28 17:29:19,155 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2019-11-28 17:29:19,349 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-28 17:29:19,350 INFO L287 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-28 17:29:19,352 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:29:19 BoogieIcfgContainer [2019-11-28 17:29:19,352 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-28 17:29:19,353 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-28 17:29:19,354 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-28 17:29:19,357 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-28 17:29:19,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 05:29:18" (1/3) ... [2019-11-28 17:29:19,359 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bc252df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 05:29:19, skipping insertion in model container [2019-11-28 17:29:19,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:29:18" (2/3) ... [2019-11-28 17:29:19,360 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bc252df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 05:29:19, skipping insertion in model container [2019-11-28 17:29:19,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:29:19" (3/3) ... [2019-11-28 17:29:19,362 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2019-11-28 17:29:19,373 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-28 17:29:19,381 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-28 17:29:19,402 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-28 17:29:19,448 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-28 17:29:19,449 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-28 17:29:19,449 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-28 17:29:19,449 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-28 17:29:19,449 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-28 17:29:19,450 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-28 17:29:19,450 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-28 17:29:19,450 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-28 17:29:19,476 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2019-11-28 17:29:19,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-28 17:29:19,484 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:19,485 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:19,486 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:19,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:19,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1871295635, now seen corresponding path program 1 times [2019-11-28 17:29:19,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:19,504 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624923114] [2019-11-28 17:29:19,504 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:19,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:19,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:19,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 17:29:19,753 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624923114] [2019-11-28 17:29:19,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-28 17:29:19,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-28 17:29:19,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753012479] [2019-11-28 17:29:19,761 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-28 17:29:19,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:19,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-28 17:29:19,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-28 17:29:19,774 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 7 states. [2019-11-28 17:29:19,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:19,912 INFO L93 Difference]: Finished difference Result 38 states and 47 transitions. [2019-11-28 17:29:19,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-28 17:29:19,915 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-11-28 17:29:19,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:19,926 INFO L225 Difference]: With dead ends: 38 [2019-11-28 17:29:19,926 INFO L226 Difference]: Without dead ends: 26 [2019-11-28 17:29:19,930 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-28 17:29:19,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-28 17:29:19,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-28 17:29:19,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-28 17:29:19,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2019-11-28 17:29:19,981 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2019-11-28 17:29:19,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:19,982 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2019-11-28 17:29:19,982 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-28 17:29:19,982 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2019-11-28 17:29:19,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-28 17:29:19,984 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:19,984 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:19,984 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:19,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:19,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1404217650, now seen corresponding path program 1 times [2019-11-28 17:29:19,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:19,985 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764284778] [2019-11-28 17:29:19,986 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:19,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:20,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:20,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 17:29:20,090 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764284778] [2019-11-28 17:29:20,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-28 17:29:20,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-28 17:29:20,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968741631] [2019-11-28 17:29:20,092 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-28 17:29:20,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:20,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-28 17:29:20,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-28 17:29:20,093 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 7 states. [2019-11-28 17:29:20,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:20,215 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2019-11-28 17:29:20,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-28 17:29:20,216 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2019-11-28 17:29:20,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:20,217 INFO L225 Difference]: With dead ends: 32 [2019-11-28 17:29:20,218 INFO L226 Difference]: Without dead ends: 28 [2019-11-28 17:29:20,219 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-28 17:29:20,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-28 17:29:20,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2019-11-28 17:29:20,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-28 17:29:20,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2019-11-28 17:29:20,228 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2019-11-28 17:29:20,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:20,229 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2019-11-28 17:29:20,229 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-28 17:29:20,230 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2019-11-28 17:29:20,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-28 17:29:20,231 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:20,232 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:20,232 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:20,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:20,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1629927371, now seen corresponding path program 1 times [2019-11-28 17:29:20,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:20,234 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483867331] [2019-11-28 17:29:20,234 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:20,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:20,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:20,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:20,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:20,404 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-28 17:29:20,405 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483867331] [2019-11-28 17:29:20,405 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502449180] [2019-11-28 17:29:20,406 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 [2019-11-28 17:29:20,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:20,448 INFO L264 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-28 17:29:20,458 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:29:20,558 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-28 17:29:20,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:29:20,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 12 [2019-11-28 17:29:20,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159983059] [2019-11-28 17:29:20,561 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-28 17:29:20,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:20,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-28 17:29:20,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2019-11-28 17:29:20,563 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 12 states. [2019-11-28 17:29:20,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:20,745 INFO L93 Difference]: Finished difference Result 59 states and 83 transitions. [2019-11-28 17:29:20,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-28 17:29:20,746 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2019-11-28 17:29:20,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:20,748 INFO L225 Difference]: With dead ends: 59 [2019-11-28 17:29:20,748 INFO L226 Difference]: Without dead ends: 35 [2019-11-28 17:29:20,750 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-11-28 17:29:20,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-28 17:29:20,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2019-11-28 17:29:20,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-28 17:29:20,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2019-11-28 17:29:20,762 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 22 [2019-11-28 17:29:20,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:20,763 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2019-11-28 17:29:20,763 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-28 17:29:20,763 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2019-11-28 17:29:20,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-28 17:29:20,765 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:20,765 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:20,971 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:20,971 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:20,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:20,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1285987244, now seen corresponding path program 1 times [2019-11-28 17:29:20,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:20,972 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513229728] [2019-11-28 17:29:20,973 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:20,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,115 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-28 17:29:21,116 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513229728] [2019-11-28 17:29:21,117 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152312851] [2019-11-28 17:29:21,117 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) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:21,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,152 INFO L264 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-28 17:29:21,154 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:29:21,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-28 17:29:21,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:29:21,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 12 [2019-11-28 17:29:21,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032015852] [2019-11-28 17:29:21,191 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-28 17:29:21,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:21,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-28 17:29:21,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2019-11-28 17:29:21,192 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand 12 states. [2019-11-28 17:29:21,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:21,464 INFO L93 Difference]: Finished difference Result 55 states and 78 transitions. [2019-11-28 17:29:21,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-28 17:29:21,465 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 23 [2019-11-28 17:29:21,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:21,474 INFO L225 Difference]: With dead ends: 55 [2019-11-28 17:29:21,474 INFO L226 Difference]: Without dead ends: 51 [2019-11-28 17:29:21,475 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-11-28 17:29:21,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-11-28 17:29:21,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2019-11-28 17:29:21,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-28 17:29:21,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 68 transitions. [2019-11-28 17:29:21,500 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 68 transitions. Word has length 23 [2019-11-28 17:29:21,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:21,502 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 68 transitions. [2019-11-28 17:29:21,502 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-28 17:29:21,503 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 68 transitions. [2019-11-28 17:29:21,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-28 17:29:21,506 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:21,506 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:21,711 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:21,711 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:21,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:21,712 INFO L82 PathProgramCache]: Analyzing trace with hash -649262923, now seen corresponding path program 1 times [2019-11-28 17:29:21,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:21,712 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286539777] [2019-11-28 17:29:21,713 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:21,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,915 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-28 17:29:21,916 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286539777] [2019-11-28 17:29:21,917 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721683464] [2019-11-28 17:29:21,917 INFO L94 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 -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 [2019-11-28 17:29:21,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:21,957 INFO L264 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-28 17:29:21,959 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:29:22,042 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-28 17:29:22,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:29:22,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 14 [2019-11-28 17:29:22,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288505564] [2019-11-28 17:29:22,045 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-28 17:29:22,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:22,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-28 17:29:22,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2019-11-28 17:29:22,046 INFO L87 Difference]: Start difference. First operand 48 states and 68 transitions. Second operand 14 states. [2019-11-28 17:29:22,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:22,479 INFO L93 Difference]: Finished difference Result 114 states and 187 transitions. [2019-11-28 17:29:22,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-28 17:29:22,480 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2019-11-28 17:29:22,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:22,483 INFO L225 Difference]: With dead ends: 114 [2019-11-28 17:29:22,483 INFO L226 Difference]: Without dead ends: 68 [2019-11-28 17:29:22,484 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2019-11-28 17:29:22,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-28 17:29:22,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2019-11-28 17:29:22,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-28 17:29:22,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 98 transitions. [2019-11-28 17:29:22,500 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 98 transitions. Word has length 35 [2019-11-28 17:29:22,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:22,501 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 98 transitions. [2019-11-28 17:29:22,501 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-28 17:29:22,501 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 98 transitions. [2019-11-28 17:29:22,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-28 17:29:22,504 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:22,504 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:22,711 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:22,712 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:22,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:22,713 INFO L82 PathProgramCache]: Analyzing trace with hash 2000747716, now seen corresponding path program 1 times [2019-11-28 17:29:22,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:22,714 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093199658] [2019-11-28 17:29:22,714 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:22,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:22,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:22,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:22,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:22,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:22,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:22,818 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-28 17:29:22,819 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093199658] [2019-11-28 17:29:22,819 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804990703] [2019-11-28 17:29:22,819 INFO L94 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 -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 [2019-11-28 17:29:22,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:22,859 INFO L264 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-28 17:29:22,861 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:29:22,956 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-28 17:29:22,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:29:22,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2019-11-28 17:29:22,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263699746] [2019-11-28 17:29:22,958 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-28 17:29:22,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:22,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-28 17:29:22,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2019-11-28 17:29:22,960 INFO L87 Difference]: Start difference. First operand 66 states and 98 transitions. Second operand 14 states. [2019-11-28 17:29:23,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:23,263 INFO L93 Difference]: Finished difference Result 147 states and 239 transitions. [2019-11-28 17:29:23,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-28 17:29:23,264 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2019-11-28 17:29:23,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:23,266 INFO L225 Difference]: With dead ends: 147 [2019-11-28 17:29:23,266 INFO L226 Difference]: Without dead ends: 83 [2019-11-28 17:29:23,269 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2019-11-28 17:29:23,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-11-28 17:29:23,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 66. [2019-11-28 17:29:23,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-28 17:29:23,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 96 transitions. [2019-11-28 17:29:23,283 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 96 transitions. Word has length 36 [2019-11-28 17:29:23,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:23,283 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 96 transitions. [2019-11-28 17:29:23,283 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-28 17:29:23,284 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 96 transitions. [2019-11-28 17:29:23,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-28 17:29:23,286 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:23,286 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:23,490 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:23,491 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:23,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:23,491 INFO L82 PathProgramCache]: Analyzing trace with hash -434541687, now seen corresponding path program 1 times [2019-11-28 17:29:23,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:23,492 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540653967] [2019-11-28 17:29:23,493 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:23,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,747 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-11-28 17:29:23,748 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540653967] [2019-11-28 17:29:23,748 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192897831] [2019-11-28 17:29:23,748 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:23,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:23,784 INFO L264 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-28 17:29:23,787 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:29:23,852 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-11-28 17:29:23,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:29:23,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 17 [2019-11-28 17:29:23,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109567212] [2019-11-28 17:29:23,854 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-28 17:29:23,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:23,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-28 17:29:23,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2019-11-28 17:29:23,857 INFO L87 Difference]: Start difference. First operand 66 states and 96 transitions. Second operand 17 states. [2019-11-28 17:29:24,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:24,325 INFO L93 Difference]: Finished difference Result 163 states and 263 transitions. [2019-11-28 17:29:24,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-28 17:29:24,326 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 50 [2019-11-28 17:29:24,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:24,329 INFO L225 Difference]: With dead ends: 163 [2019-11-28 17:29:24,329 INFO L226 Difference]: Without dead ends: 99 [2019-11-28 17:29:24,330 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2019-11-28 17:29:24,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-11-28 17:29:24,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2019-11-28 17:29:24,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-11-28 17:29:24,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 143 transitions. [2019-11-28 17:29:24,349 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 143 transitions. Word has length 50 [2019-11-28 17:29:24,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:24,349 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 143 transitions. [2019-11-28 17:29:24,349 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-28 17:29:24,349 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 143 transitions. [2019-11-28 17:29:24,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-28 17:29:24,352 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:24,352 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:24,561 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:24,561 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:24,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:24,562 INFO L82 PathProgramCache]: Analyzing trace with hash -751947822, now seen corresponding path program 1 times [2019-11-28 17:29:24,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:24,562 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133931366] [2019-11-28 17:29:24,562 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:24,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,800 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-28 17:29:24,800 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133931366] [2019-11-28 17:29:24,801 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201431452] [2019-11-28 17:29:24,801 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:24,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:24,848 INFO L264 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-28 17:29:24,851 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:29:24,917 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-28 17:29:24,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:29:24,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 15 [2019-11-28 17:29:24,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790818034] [2019-11-28 17:29:24,919 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-28 17:29:24,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:24,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-28 17:29:24,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2019-11-28 17:29:24,920 INFO L87 Difference]: Start difference. First operand 91 states and 143 transitions. Second operand 15 states. [2019-11-28 17:29:25,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:25,268 INFO L93 Difference]: Finished difference Result 182 states and 293 transitions. [2019-11-28 17:29:25,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-28 17:29:25,269 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 51 [2019-11-28 17:29:25,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:25,270 INFO L225 Difference]: With dead ends: 182 [2019-11-28 17:29:25,271 INFO L226 Difference]: Without dead ends: 91 [2019-11-28 17:29:25,272 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2019-11-28 17:29:25,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-11-28 17:29:25,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 83. [2019-11-28 17:29:25,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-28 17:29:25,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 123 transitions. [2019-11-28 17:29:25,286 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 123 transitions. Word has length 51 [2019-11-28 17:29:25,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:25,286 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 123 transitions. [2019-11-28 17:29:25,286 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-28 17:29:25,287 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 123 transitions. [2019-11-28 17:29:25,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-11-28 17:29:25,289 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:25,290 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:25,492 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:25,493 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:25,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:25,494 INFO L82 PathProgramCache]: Analyzing trace with hash 629760405, now seen corresponding path program 2 times [2019-11-28 17:29:25,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:25,495 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342540931] [2019-11-28 17:29:25,495 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:25,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:29:25,789 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 31 proven. 51 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-11-28 17:29:25,790 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342540931] [2019-11-28 17:29:25,790 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364892942] [2019-11-28 17:29:25,790 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:25,843 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-28 17:29:25,843 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-28 17:29:25,844 INFO L264 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-28 17:29:25,848 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:29:25,983 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 44 proven. 17 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-28 17:29:25,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:29:25,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 22 [2019-11-28 17:29:25,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657457963] [2019-11-28 17:29:25,989 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-28 17:29:25,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:29:25,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-28 17:29:25,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2019-11-28 17:29:25,991 INFO L87 Difference]: Start difference. First operand 83 states and 123 transitions. Second operand 22 states. [2019-11-28 17:29:26,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:29:26,512 INFO L93 Difference]: Finished difference Result 189 states and 316 transitions. [2019-11-28 17:29:26,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-28 17:29:26,513 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 78 [2019-11-28 17:29:26,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:29:26,520 INFO L225 Difference]: With dead ends: 189 [2019-11-28 17:29:26,520 INFO L226 Difference]: Without dead ends: 100 [2019-11-28 17:29:26,522 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=637, Unknown=0, NotChecked=0, Total=756 [2019-11-28 17:29:26,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-11-28 17:29:26,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 87. [2019-11-28 17:29:26,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-11-28 17:29:26,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 120 transitions. [2019-11-28 17:29:26,556 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 120 transitions. Word has length 78 [2019-11-28 17:29:26,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:29:26,557 INFO L462 AbstractCegarLoop]: Abstraction has 87 states and 120 transitions. [2019-11-28 17:29:26,557 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-28 17:29:26,557 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 120 transitions. [2019-11-28 17:29:26,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-28 17:29:26,561 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:29:26,562 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:29:26,774 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:29:26,775 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:29:26,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:29:26,775 INFO L82 PathProgramCache]: Analyzing trace with hash -26046796, now seen corresponding path program 1 times [2019-11-28 17:29:26,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:29:26,776 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997072341] [2019-11-28 17:29:26,776 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:29:26,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 17:29:26,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 17:29:26,814 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-28 17:29:26,814 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-28 17:29:26,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 05:29:26 BoogieIcfgContainer [2019-11-28 17:29:26,864 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-28 17:29:26,865 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-28 17:29:26,865 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-28 17:29:26,866 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-28 17:29:26,866 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:29:19" (3/4) ... [2019-11-28 17:29:26,869 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-28 17:29:26,984 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-28 17:29:26,985 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-28 17:29:26,988 INFO L168 Benchmark]: Toolchain (without parser) took 8276.57 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 271.1 MB). Free memory was 956.3 MB in the beginning and 1.2 GB in the end (delta: -271.3 MB). There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:29:26,989 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 1.0 GB. Free memory is still 987.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:29:26,990 INFO L168 Benchmark]: CACSL2BoogieTranslator took 276.82 ms. Allocated memory is still 1.0 GB. Free memory was 956.3 MB in the beginning and 945.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-28 17:29:26,990 INFO L168 Benchmark]: Boogie Procedure Inliner took 84.16 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 131.1 MB). Free memory was 945.6 MB in the beginning and 1.1 GB in the end (delta: -188.6 MB). Peak memory consumption was 9.7 MB. Max. memory is 11.5 GB. [2019-11-28 17:29:26,991 INFO L168 Benchmark]: Boogie Preprocessor took 21.45 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 11.5 GB. [2019-11-28 17:29:26,992 INFO L168 Benchmark]: RCFGBuilder took 257.03 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 11.5 GB. [2019-11-28 17:29:26,994 INFO L168 Benchmark]: TraceAbstraction took 7511.19 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 140.0 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -129.2 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. [2019-11-28 17:29:26,995 INFO L168 Benchmark]: Witness Printer took 120.23 ms. Allocated memory is still 1.3 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 11.5 GB. [2019-11-28 17:29:26,998 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 1.0 GB. Free memory is still 987.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 276.82 ms. Allocated memory is still 1.0 GB. Free memory was 956.3 MB in the beginning and 945.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 84.16 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 131.1 MB). Free memory was 945.6 MB in the beginning and 1.1 GB in the end (delta: -188.6 MB). Peak memory consumption was 9.7 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 21.45 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 11.5 GB. * RCFGBuilder took 257.03 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 7511.19 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 140.0 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -129.2 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. * Witness Printer took 120.23 ms. Allocated memory is still 1.3 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 11.5 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 = 4; [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) 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); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 3 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 28 locations, 1 error locations. Result: UNSAFE, OverallTime: 7.3s, OverallIterations: 10, TraceHistogramMax: 6, AutomataDifference: 2.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 210 SDtfs, 383 SDslu, 1378 SDs, 0 SdLazy, 2114 SolverSat, 292 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 503 GetRequests, 366 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 1.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=91occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 9 MinimizatonAttempts, 55 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.1s InterpolantComputationTime, 673 NumberOfCodeBlocks, 673 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 593 ConstructedInterpolants, 0 QuantifiedInterpolants, 60425 SizeOfPredicates, 25 NumberOfNonLiveVariables, 676 ConjunctsInSsa, 51 ConjunctsInUnsatCore, 16 InterpolantComputations, 2 PerfectInterpolantSequences, 378/526 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...