/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -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-eb0fd7c [2020-09-21 11:20:29,213 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 11:20:29,218 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 11:20:29,269 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 11:20:29,271 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 11:20:29,282 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 11:20:29,284 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 11:20:29,287 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 11:20:29,289 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 11:20:29,290 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 11:20:29,291 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 11:20:29,294 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 11:20:29,294 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 11:20:29,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 11:20:29,301 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 11:20:29,303 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 11:20:29,305 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 11:20:29,307 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 11:20:29,309 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 11:20:29,316 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 11:20:29,318 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 11:20:29,320 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 11:20:29,321 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 11:20:29,322 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 11:20:29,326 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 11:20:29,327 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 11:20:29,327 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 11:20:29,330 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 11:20:29,330 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 11:20:29,331 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 11:20:29,332 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 11:20:29,333 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 11:20:29,334 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 11:20:29,335 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 11:20:29,336 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 11:20:29,336 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 11:20:29,337 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 11:20:29,337 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 11:20:29,337 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 11:20:29,338 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 11:20:29,340 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 11:20:29,341 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 11:20:29,372 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 11:20:29,372 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 11:20:29,373 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 11:20:29,374 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 11:20:29,374 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 11:20:29,374 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 11:20:29,374 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 11:20:29,374 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 11:20:29,375 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 11:20:29,375 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 11:20:29,375 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 11:20:29,375 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 11:20:29,376 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 11:20:29,376 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 11:20:29,376 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 11:20:29,376 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 11:20:29,376 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 11:20:29,377 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 11:20:29,377 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 11:20:29,377 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 11:20:29,377 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 11:20:29,378 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 11:20:29,378 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 11:20:29,378 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 11:20:29,378 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 11:20:29,379 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 11:20:29,379 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 11:20:29,379 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 11:20:29,379 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 11:20:29,379 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; [2020-09-21 11:20:29,822 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 11:20:29,850 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 11:20:29,855 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 11:20:29,857 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 11:20:29,857 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 11:20:29,858 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-09-21 11:20:29,959 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/376435ea6/5efe0fc5875e47069fca61ba52bd001a/FLAG8b81262b7 [2020-09-21 11:20:30,528 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 11:20:30,529 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-09-21 11:20:30,538 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/376435ea6/5efe0fc5875e47069fca61ba52bd001a/FLAG8b81262b7 [2020-09-21 11:20:30,882 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/376435ea6/5efe0fc5875e47069fca61ba52bd001a [2020-09-21 11:20:30,898 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 11:20:30,905 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 11:20:30,906 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 11:20:30,907 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 11:20:30,919 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 11:20:30,921 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 11:20:30" (1/1) ... [2020-09-21 11:20:30,925 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c1aada5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:30, skipping insertion in model container [2020-09-21 11:20:30,926 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 11:20:30" (1/1) ... [2020-09-21 11:20:30,933 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 11:20:30,956 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 11:20:31,159 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 11:20:31,165 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 11:20:31,186 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 11:20:31,205 INFO L208 MainTranslator]: Completed translation [2020-09-21 11:20:31,206 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31 WrapperNode [2020-09-21 11:20:31,206 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 11:20:31,207 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 11:20:31,207 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 11:20:31,207 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 11:20:31,226 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (1/1) ... [2020-09-21 11:20:31,227 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (1/1) ... [2020-09-21 11:20:31,321 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (1/1) ... [2020-09-21 11:20:31,322 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (1/1) ... [2020-09-21 11:20:31,327 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (1/1) ... [2020-09-21 11:20:31,329 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (1/1) ... [2020-09-21 11:20:31,330 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (1/1) ... [2020-09-21 11:20:31,332 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 11:20:31,333 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 11:20:31,333 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 11:20:31,333 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 11:20:31,334 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 11:20:31,416 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 11:20:31,417 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 11:20:31,417 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-09-21 11:20:31,417 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-09-21 11:20:31,417 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 11:20:31,418 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 11:20:31,418 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 11:20:31,418 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-09-21 11:20:31,418 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-09-21 11:20:31,418 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 11:20:31,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 11:20:31,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 11:20:31,657 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 11:20:31,658 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-21 11:20:31,663 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 11:20:31 BoogieIcfgContainer [2020-09-21 11:20:31,664 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 11:20:31,665 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 11:20:31,666 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 11:20:31,669 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 11:20:31,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 11:20:30" (1/3) ... [2020-09-21 11:20:31,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77377e1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 11:20:31, skipping insertion in model container [2020-09-21 11:20:31,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:20:31" (2/3) ... [2020-09-21 11:20:31,672 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77377e1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 11:20:31, skipping insertion in model container [2020-09-21 11:20:31,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 11:20:31" (3/3) ... [2020-09-21 11:20:31,674 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-09-21 11:20:31,689 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 11:20:31,703 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 11:20:31,732 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 11:20:31,775 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 11:20:31,775 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 11:20:31,776 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 11:20:31,776 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 11:20:31,776 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 11:20:31,776 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 11:20:31,777 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 11:20:31,777 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 11:20:31,804 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-09-21 11:20:31,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-21 11:20:31,813 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:20:31,815 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:20:31,815 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:20:31,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:20:31,826 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-09-21 11:20:31,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:20:31,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033121283] [2020-09-21 11:20:31,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:20:31,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:31,983 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:31,984 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:31,984 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:31,984 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:31,985 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-09-21 11:20:31,985 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:31,985 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 33 [2020-09-21 11:20:31,985 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:31,985 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 11:20:31,986 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:20:31,986 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-21 11:20:31,986 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:20:32,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:20:32,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,057 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,058 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,058 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,058 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,058 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:20:32,059 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,059 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:20:32,059 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,059 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:20:32,060 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:20:32,060 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:20:32,060 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:20:32,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 11:20:32,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,080 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,081 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,081 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,081 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,082 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-21 11:20:32,082 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,082 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-09-21 11:20:32,082 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,082 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 11:20:32,083 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-09-21 11:20:32,083 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-21 11:20:32,083 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:20:32,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:20:32,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033121283] [2020-09-21 11:20:32,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 11:20:32,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 11:20:32,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550182902] [2020-09-21 11:20:32,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 11:20:32,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:20:32,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 11:20:32,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 11:20:32,149 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-09-21 11:20:32,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:20:32,297 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-09-21 11:20:32,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 11:20:32,299 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-09-21 11:20:32,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:20:32,314 INFO L225 Difference]: With dead ends: 44 [2020-09-21 11:20:32,314 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 11:20:32,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 11:20:32,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 11:20:32,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-09-21 11:20:32,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-21 11:20:32,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-09-21 11:20:32,374 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-09-21 11:20:32,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:20:32,374 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-09-21 11:20:32,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 11:20:32,374 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-09-21 11:20:32,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-21 11:20:32,376 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:20:32,376 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:20:32,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 11:20:32,377 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:20:32,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:20:32,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-09-21 11:20:32,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:20:32,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1566325667] [2020-09-21 11:20:32,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:20:32,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,398 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,399 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,399 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,399 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,400 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-09-21 11:20:32,400 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,400 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-09-21 11:20:32,400 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,401 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 11:20:32,401 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:20:32,401 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-21 11:20:32,401 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:20:32,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:20:32,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,427 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,427 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,427 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,428 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,428 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:20:32,428 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,429 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:20:32,429 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:20:32,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:20:32,430 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:20:32,430 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:20:32,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 11:20:32,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,447 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,448 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,448 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,448 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,449 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-21 11:20:32,449 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,449 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-09-21 11:20:32,449 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,450 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 11:20:32,450 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-09-21 11:20:32,450 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-21 11:20:32,451 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:20:32,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:20:32,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1566325667] [2020-09-21 11:20:32,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 11:20:32,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 11:20:32,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711845303] [2020-09-21 11:20:32,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 11:20:32,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:20:32,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 11:20:32,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 11:20:32,486 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-09-21 11:20:32,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:20:32,572 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-09-21 11:20:32,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 11:20:32,573 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-09-21 11:20:32,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:20:32,575 INFO L225 Difference]: With dead ends: 36 [2020-09-21 11:20:32,575 INFO L226 Difference]: Without dead ends: 32 [2020-09-21 11:20:32,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 11:20:32,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-21 11:20:32,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-09-21 11:20:32,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-21 11:20:32,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-09-21 11:20:32,586 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-09-21 11:20:32,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:20:32,587 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-09-21 11:20:32,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 11:20:32,587 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-09-21 11:20:32,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 11:20:32,589 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:20:32,589 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] [2020-09-21 11:20:32,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 11:20:32,589 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:20:32,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:20:32,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-09-21 11:20:32,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:20:32,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1695455304] [2020-09-21 11:20:32,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:20:32,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,626 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,626 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,626 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,626 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,627 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 39 [2020-09-21 11:20:32,627 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,627 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 17 [2020-09-21 11:20:32,627 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,628 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-21 11:20:32,628 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 11:20:32,628 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-09-21 11:20:32,628 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:20:32,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:20:32,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,656 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,656 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,656 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,657 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,657 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:20:32,657 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,657 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:20:32,658 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,658 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:20:32,658 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:20:32,658 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:20:32,659 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:20:32,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 11:20:32,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,684 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,684 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,685 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,685 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,685 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-09-21 11:20:32,686 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,686 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 12 [2020-09-21 11:20:32,686 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,686 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-09-21 11:20:32,687 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 4 [2020-09-21 11:20:32,687 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-21 11:20:32,687 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:20:32,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 11:20:32,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,733 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,733 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,734 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,734 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,734 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-21 11:20:32,735 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,735 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-09-21 11:20:32,735 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 11:20:32,736 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-09-21 11:20:32,736 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-21 11:20:32,736 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:20:32,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 11:20:32,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:20:32,766 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:20:32,767 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:20:32,767 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:20:32,768 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:20:32,768 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-21 11:20:32,768 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:20:32,768 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:20:32,769 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:20:32,769 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:20:32,769 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 7 [2020-09-21 11:20:32,770 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:20:32,770 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:20:32,778 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 11:20:32,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1695455304] [2020-09-21 11:20:32,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:20:32,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 11:20:32,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742085674] [2020-09-21 11:20:32,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 11:20:32,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:20:32,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 11:20:32,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-21 11:20:32,781 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 7 states. [2020-09-21 11:20:32,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:20:32,922 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2020-09-21 11:20:32,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 11:20:32,922 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2020-09-21 11:20:32,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:20:32,924 INFO L225 Difference]: With dead ends: 58 [2020-09-21 11:20:32,924 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 11:20:32,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-09-21 11:20:32,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 11:20:32,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-09-21 11:20:32,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-21 11:20:32,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-09-21 11:20:32,936 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 26 [2020-09-21 11:20:32,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:20:32,936 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-09-21 11:20:32,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 11:20:32,937 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-09-21 11:20:32,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-21 11:20:32,939 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:20:32,939 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] [2020-09-21 11:20:32,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 11:20:32,939 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:20:32,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:20:32,940 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-09-21 11:20:32,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:20:32,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052520996] [2020-09-21 11:20:32,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:20:32,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-21 11:20:32,959 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-21 11:20:32,959 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-21 11:20:32,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 11:20:32,988 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 11:20:32 BoogieIcfgContainer [2020-09-21 11:20:32,988 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 11:20:32,992 INFO L168 Benchmark]: Toolchain (without parser) took 2090.51 ms. Allocated memory was 148.4 MB in the beginning and 234.9 MB in the end (delta: 86.5 MB). Free memory was 104.6 MB in the beginning and 197.0 MB in the end (delta: -92.4 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-21 11:20:32,993 INFO L168 Benchmark]: CDTParser took 0.92 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-21 11:20:32,994 INFO L168 Benchmark]: CACSL2BoogieTranslator took 300.26 ms. Allocated memory is still 148.4 MB. Free memory was 104.1 MB in the beginning and 94.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-09-21 11:20:32,995 INFO L168 Benchmark]: Boogie Preprocessor took 125.55 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 94.5 MB in the beginning and 184.1 MB in the end (delta: -89.6 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-09-21 11:20:32,996 INFO L168 Benchmark]: RCFGBuilder took 330.88 ms. Allocated memory is still 205.0 MB. Free memory was 184.1 MB in the beginning and 170.5 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-09-21 11:20:32,997 INFO L168 Benchmark]: TraceAbstraction took 1323.08 ms. Allocated memory was 205.0 MB in the beginning and 234.9 MB in the end (delta: 29.9 MB). Free memory was 169.9 MB in the beginning and 197.0 MB in the end (delta: -27.1 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. [2020-09-21 11:20:33,001 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.92 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 300.26 ms. Allocated memory is still 148.4 MB. Free memory was 104.1 MB in the beginning and 94.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 125.55 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 94.5 MB in the beginning and 184.1 MB in the end (delta: -89.6 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 330.88 ms. Allocated memory is still 205.0 MB. Free memory was 184.1 MB in the beginning and 170.5 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1323.08 ms. Allocated memory was 205.0 MB in the beginning and 234.9 MB in the end (delta: 29.9 MB). Free memory was 169.9 MB in the beginning and 197.0 MB in the end (delta: -27.1 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 2; [L37] CALL, EXPR fibo1(x) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND TRUE n < 1 [L19] return 0; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 1 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.1s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 91 SDtfs, 43 SDslu, 232 SDs, 0 SdLazy, 107 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 80 NumberOfCodeBlocks, 80 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 50 ConstructedInterpolants, 0 QuantifiedInterpolants, 1464 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 2 PerfectInterpolantSequences, 1/4 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...