/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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 --rcfgbuilder.size.of.a.code.block SequenceOfStatements --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 enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf language data_model -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-28 17:19:53,665 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-28 17:19:53,669 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-28 17:19:53,729 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-28 17:19:53,730 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-28 17:19:53,738 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-28 17:19:53,741 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-28 17:19:53,746 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-28 17:19:53,750 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-28 17:19:53,753 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-28 17:19:53,757 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-28 17:19:53,759 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-28 17:19:53,759 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-28 17:19:53,760 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-28 17:19:53,761 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-28 17:19:53,762 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-28 17:19:53,763 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-28 17:19:53,764 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-28 17:19:53,766 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-28 17:19:53,768 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-28 17:19:53,770 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-28 17:19:53,772 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-28 17:19:53,773 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-28 17:19:53,774 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-28 17:19:53,777 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-28 17:19:53,777 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-28 17:19:53,778 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-28 17:19:53,779 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-28 17:19:53,779 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-28 17:19:53,780 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-28 17:19:53,780 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-28 17:19:53,781 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-28 17:19:53,782 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-28 17:19:53,783 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-28 17:19:53,784 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-28 17:19:53,785 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-28 17:19:53,786 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-28 17:19:53,786 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-28 17:19:53,786 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-28 17:19:53,799 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-28 17:19:53,800 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-28 17:19:53,801 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 [2020-10-28 17:19:53,827 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-28 17:19:53,828 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-28 17:19:53,829 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-28 17:19:53,830 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-28 17:19:53,830 INFO L138 SettingsManager]: * Use SBE=true [2020-10-28 17:19:53,830 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-28 17:19:53,830 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-28 17:19:53,831 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-28 17:19:53,831 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-28 17:19:53,831 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-28 17:19:53,831 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-28 17:19:53,832 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-28 17:19:53,832 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-28 17:19:53,832 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-28 17:19:53,832 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-28 17:19:53,833 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-28 17:19:53,833 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-28 17:19:53,833 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-28 17:19:53,833 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-28 17:19:53,834 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-28 17:19:53,834 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-28 17:19:53,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-28 17:19:53,835 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-28 17:19:53,835 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-28 17:19:53,835 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-28 17:19:53,835 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-28 17:19:53,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-28 17:19:53,836 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-28 17:19:53,836 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-28 17:19:53,836 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true;unknown-allowed=true; [2020-10-28 17:19:54,201 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-28 17:19:54,255 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-28 17:19:54,258 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-28 17:19:54,260 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-28 17:19:54,260 INFO L275 PluginConnector]: CDTParser initialized [2020-10-28 17:19:54,261 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-10-28 17:19:54,347 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f3a3824c9/c8f9046990a1403c89cc2d89e648719e/FLAGf56bf6501 [2020-10-28 17:19:55,027 INFO L306 CDTParser]: Found 1 translation units. [2020-10-28 17:19:55,028 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-10-28 17:19:55,035 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f3a3824c9/c8f9046990a1403c89cc2d89e648719e/FLAGf56bf6501 [2020-10-28 17:19:55,398 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f3a3824c9/c8f9046990a1403c89cc2d89e648719e [2020-10-28 17:19:55,401 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-28 17:19:55,409 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-28 17:19:55,413 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-28 17:19:55,414 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-28 17:19:55,418 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-28 17:19:55,419 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,422 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@524a35d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55, skipping insertion in model container [2020-10-28 17:19:55,423 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,432 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-28 17:19:55,449 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-28 17:19:55,617 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 17:19:55,628 INFO L203 MainTranslator]: Completed pre-run [2020-10-28 17:19:55,648 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 17:19:55,665 INFO L208 MainTranslator]: Completed translation [2020-10-28 17:19:55,666 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55 WrapperNode [2020-10-28 17:19:55,666 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-28 17:19:55,668 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-28 17:19:55,668 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-28 17:19:55,668 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-28 17:19:55,681 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,682 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,690 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,691 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,697 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,699 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,701 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (1/1) ... [2020-10-28 17:19:55,703 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-28 17:19:55,705 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-28 17:19:55,705 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-28 17:19:55,705 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-28 17:19:55,706 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (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 [2020-10-28 17:19:55,794 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-28 17:19:55,794 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-28 17:19:55,795 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-28 17:19:55,795 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-10-28 17:19:55,796 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-10-28 17:19:55,796 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-28 17:19:55,796 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-28 17:19:55,796 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-28 17:19:55,796 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-28 17:19:55,796 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-28 17:19:55,797 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-28 17:19:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-10-28 17:19:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-10-28 17:19:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-28 17:19:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-28 17:19:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-28 17:19:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-28 17:19:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-28 17:19:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-28 17:19:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-28 17:19:56,136 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-28 17:19:56,136 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-28 17:19:56,138 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 05:19:56 BoogieIcfgContainer [2020-10-28 17:19:56,138 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-28 17:19:56,141 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-28 17:19:56,141 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-28 17:19:56,145 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-28 17:19:56,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 05:19:55" (1/3) ... [2020-10-28 17:19:56,147 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b34cca7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 05:19:56, skipping insertion in model container [2020-10-28 17:19:56,147 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 05:19:55" (2/3) ... [2020-10-28 17:19:56,148 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b34cca7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 05:19:56, skipping insertion in model container [2020-10-28 17:19:56,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 05:19:56" (3/3) ... [2020-10-28 17:19:56,150 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-10-28 17:19:56,193 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-28 17:19:56,204 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-28 17:19:56,221 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-28 17:19:56,253 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-28 17:19:56,253 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-28 17:19:56,253 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-28 17:19:56,253 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-28 17:19:56,254 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-28 17:19:56,254 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-28 17:19:56,254 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-28 17:19:56,254 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-28 17:19:56,275 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-10-28 17:19:56,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-28 17:19:56,282 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:19:56,283 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:19:56,283 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:19:56,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:19:56,291 INFO L82 PathProgramCache]: Analyzing trace with hash 219823047, now seen corresponding path program 1 times [2020-10-28 17:19:56,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:19:56,302 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920208333] [2020-10-28 17:19:56,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:19:56,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:19:56,499 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:56,558 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:57,127 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:19:57,127 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-28 17:19:57,128 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 17:19:57,128 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 656 [2020-10-28 17:19:57,131 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:19:57,132 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:19:57,132 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 17:19:57,132 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-28 17:19:57,132 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-28 17:19:57,133 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-28 17:19:57,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:19:57,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:19:57,241 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:57,248 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:19:57,248 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:19:57,248 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:19:57,249 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-28 17:19:57,249 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:19:57,249 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:19:57,249 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:19:57,250 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:19:57,250 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:19:57,250 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:19:57,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-28 17:19:57,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:19:57,272 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:57,289 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:19:57,290 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-28 17:19:57,290 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:19:57,290 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 24 [2020-10-28 17:19:57,290 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:19:57,291 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:19:57,291 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 17:19:57,291 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-10-28 17:19:57,291 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-28 17:19:57,291 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:19:57,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 17:19:57,345 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920208333] [2020-10-28 17:19:57,348 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:19:57,348 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-28 17:19:57,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091463343] [2020-10-28 17:19:57,354 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-28 17:19:57,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:19:57,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-28 17:19:57,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-28 17:19:57,372 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 6 states. [2020-10-28 17:19:57,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:19:57,711 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-10-28 17:19:57,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-28 17:19:57,714 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-28 17:19:57,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:19:57,733 INFO L225 Difference]: With dead ends: 50 [2020-10-28 17:19:57,734 INFO L226 Difference]: Without dead ends: 32 [2020-10-28 17:19:57,739 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-28 17:19:57,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-28 17:19:57,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-10-28 17:19:57,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-28 17:19:57,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-10-28 17:19:57,831 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 15 [2020-10-28 17:19:57,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:19:57,832 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-10-28 17:19:57,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-28 17:19:57,833 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-10-28 17:19:57,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-28 17:19:57,838 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:19:57,839 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, 1, 1] [2020-10-28 17:19:57,839 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-28 17:19:57,839 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:19:57,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:19:57,842 INFO L82 PathProgramCache]: Analyzing trace with hash 2083135015, now seen corresponding path program 1 times [2020-10-28 17:19:57,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:19:57,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071048909] [2020-10-28 17:19:57,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:19:57,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:19:57,885 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:57,913 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:58,007 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:59,424 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:19:59,425 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 42 [2020-10-28 17:19:59,425 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-28 17:19:59,425 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1552 [2020-10-28 17:19:59,426 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:19:59,426 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:19:59,426 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-28 17:19:59,426 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-28 17:19:59,427 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-28 17:19:59,427 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:19:59,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:19:59,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:19:59,491 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:59,496 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:19:59,497 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:19:59,497 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:19:59,497 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-28 17:19:59,497 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:19:59,498 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:19:59,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:19:59,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:19:59,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:19:59,498 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:19:59,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-28 17:19:59,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:19:59,508 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:59,514 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:59,629 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:19:59,629 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-10-28 17:19:59,629 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 17:19:59,629 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 122 [2020-10-28 17:19:59,630 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:19:59,630 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:19:59,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-28 17:19:59,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:19:59,631 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-28 17:19:59,631 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:19:59,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-28 17:19:59,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:19:59,668 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:59,671 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:19:59,671 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-28 17:19:59,671 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:19:59,672 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-28 17:19:59,672 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:19:59,672 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:19:59,672 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-28 17:19:59,673 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:19:59,673 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-28 17:19:59,673 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:19:59,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-10-28 17:19:59,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:19:59,690 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:19:59,695 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:19:59,695 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-28 17:19:59,695 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:19:59,696 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-28 17:19:59,696 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:19:59,696 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:19:59,696 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 17:19:59,697 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:19:59,697 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-28 17:19:59,697 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:19:59,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-28 17:19:59,704 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071048909] [2020-10-28 17:19:59,704 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:19:59,704 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-10-28 17:19:59,705 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669226074] [2020-10-28 17:19:59,706 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-28 17:19:59,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:19:59,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-28 17:19:59,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-10-28 17:19:59,708 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 9 states. [2020-10-28 17:20:00,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:20:00,172 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2020-10-28 17:20:00,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-28 17:20:00,172 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-10-28 17:20:00,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:20:00,175 INFO L225 Difference]: With dead ends: 47 [2020-10-28 17:20:00,175 INFO L226 Difference]: Without dead ends: 42 [2020-10-28 17:20:00,176 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2020-10-28 17:20:00,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-10-28 17:20:00,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 37. [2020-10-28 17:20:00,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-28 17:20:00,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 47 transitions. [2020-10-28 17:20:00,189 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 47 transitions. Word has length 28 [2020-10-28 17:20:00,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:20:00,190 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 47 transitions. [2020-10-28 17:20:00,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-28 17:20:00,190 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 47 transitions. [2020-10-28 17:20:00,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-28 17:20:00,192 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:20:00,193 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:20:00,193 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-28 17:20:00,193 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:20:00,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:20:00,194 INFO L82 PathProgramCache]: Analyzing trace with hash -8421658, now seen corresponding path program 1 times [2020-10-28 17:20:00,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:20:00,194 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554789557] [2020-10-28 17:20:00,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:20:00,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:20:00,212 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:00,235 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:00,247 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:00,336 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:00,348 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:00,893 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:01,717 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:20:01,718 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 43 [2020-10-28 17:20:01,718 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-10-28 17:20:01,718 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1509 [2020-10-28 17:20:01,719 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:20:01,719 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:20:01,719 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-28 17:20:01,719 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-28 17:20:01,720 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-28 17:20:01,720 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:20:01,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 17:20:01,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:20:01,779 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:01,792 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:20:01,793 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 17:20:01,793 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:20:01,793 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 18 [2020-10-28 17:20:01,794 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:20:01,799 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:20:01,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 17:20:01,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:20:01,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 17:20:01,799 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 6 [2020-10-28 17:20:01,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-28 17:20:01,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:20:01,812 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:01,820 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:01,830 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:01,892 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:01,906 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:02,014 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:20:02,015 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-28 17:20:02,016 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-28 17:20:02,016 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 205 [2020-10-28 17:20:02,017 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:20:02,017 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:20:02,018 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-28 17:20:02,018 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-10-28 17:20:02,018 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-10-28 17:20:02,019 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-28 17:20:02,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-28 17:20:02,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:20:02,054 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:02,060 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:20:02,061 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-28 17:20:02,061 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 17:20:02,061 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-28 17:20:02,061 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:20:02,062 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:20:02,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 17:20:02,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:20:02,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-28 17:20:02,063 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:20:02,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-10-28 17:20:02,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 17:20:02,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:02,078 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 17:20:02,093 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 17:20:02,093 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-10-28 17:20:02,094 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 17:20:02,094 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 24 [2020-10-28 17:20:02,094 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 17:20:02,095 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 17:20:02,095 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-28 17:20:02,095 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 17:20:02,095 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-28 17:20:02,096 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 17:20:02,130 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-28 17:20:02,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554789557] [2020-10-28 17:20:02,132 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 17:20:02,132 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-28 17:20:02,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215673950] [2020-10-28 17:20:02,133 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-28 17:20:02,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 17:20:02,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-28 17:20:02,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-28 17:20:02,135 INFO L87 Difference]: Start difference. First operand 37 states and 47 transitions. Second operand 8 states. [2020-10-28 17:20:02,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 17:20:02,584 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2020-10-28 17:20:02,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-28 17:20:02,584 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-10-28 17:20:02,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 17:20:02,587 INFO L225 Difference]: With dead ends: 45 [2020-10-28 17:20:02,587 INFO L226 Difference]: Without dead ends: 40 [2020-10-28 17:20:02,588 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-10-28 17:20:02,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-10-28 17:20:02,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2020-10-28 17:20:02,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-28 17:20:02,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 47 transitions. [2020-10-28 17:20:02,602 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 47 transitions. Word has length 29 [2020-10-28 17:20:02,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 17:20:02,602 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 47 transitions. [2020-10-28 17:20:02,602 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-28 17:20:02,602 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 47 transitions. [2020-10-28 17:20:02,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-28 17:20:02,604 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 17:20:02,604 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 17:20:02,604 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-28 17:20:02,605 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 17:20:02,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 17:20:02,605 INFO L82 PathProgramCache]: Analyzing trace with hash 752879968, now seen corresponding path program 2 times [2020-10-28 17:20:02,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 17:20:02,606 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223027942] [2020-10-28 17:20:02,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 17:20:02,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-28 17:20:02,619 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-28 17:20:02,619 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-28 17:20:02,624 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-28 17:20:02,641 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.10 05:20:02 BoogieIcfgContainer [2020-10-28 17:20:02,641 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-28 17:20:02,644 INFO L168 Benchmark]: Toolchain (without parser) took 7239.88 ms. Allocated memory was 172.0 MB in the beginning and 248.5 MB in the end (delta: 76.5 MB). Free memory was 148.1 MB in the beginning and 188.6 MB in the end (delta: -40.4 MB). Peak memory consumption was 36.4 MB. Max. memory is 8.0 GB. [2020-10-28 17:20:02,645 INFO L168 Benchmark]: CDTParser took 0.69 ms. Allocated memory is still 125.8 MB. Free memory was 100.4 MB in the beginning and 100.4 MB in the end (delta: 69.8 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-28 17:20:02,646 INFO L168 Benchmark]: CACSL2BoogieTranslator took 253.36 ms. Allocated memory is still 172.0 MB. Free memory was 147.4 MB in the beginning and 138.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-28 17:20:02,647 INFO L168 Benchmark]: Boogie Preprocessor took 36.06 ms. Allocated memory is still 172.0 MB. Free memory was 138.1 MB in the beginning and 136.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-28 17:20:02,648 INFO L168 Benchmark]: RCFGBuilder took 433.98 ms. Allocated memory is still 172.0 MB. Free memory was 136.8 MB in the beginning and 122.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2020-10-28 17:20:02,649 INFO L168 Benchmark]: TraceAbstraction took 6500.68 ms. Allocated memory was 172.0 MB in the beginning and 248.5 MB in the end (delta: 76.5 MB). Free memory was 122.1 MB in the beginning and 188.6 MB in the end (delta: -66.5 MB). Peak memory consumption was 10.2 MB. Max. memory is 8.0 GB. [2020-10-28 17:20:02,653 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.69 ms. Allocated memory is still 125.8 MB. Free memory was 100.4 MB in the beginning and 100.4 MB in the end (delta: 69.8 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 253.36 ms. Allocated memory is still 172.0 MB. Free memory was 147.4 MB in the beginning and 138.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.06 ms. Allocated memory is still 172.0 MB. Free memory was 138.1 MB in the beginning and 136.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 433.98 ms. Allocated memory is still 172.0 MB. Free memory was 136.8 MB in the beginning and 122.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6500.68 ms. Allocated memory was 172.0 MB in the beginning and 248.5 MB in the end (delta: 76.5 MB). Free memory was 122.1 MB in the beginning and 188.6 MB in the end (delta: -66.5 MB). Peak memory consumption was 10.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L38] int x = 2; [L39] CALL, EXPR fibo1(x) [L10] COND FALSE !(n < 1) [L12] COND FALSE !(n == 1) [L15] CALL, EXPR fibo2(n-1) [L20] COND FALSE !(n < 1) [L22] COND TRUE n == 1 [L23] return 1; [L15] RET, EXPR fibo2(n-1) [L15] CALL, EXPR fibo2(n-2) [L20] COND TRUE n < 1 [L21] return 0; [L15] RET, EXPR fibo2(n-2) [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) [L39] int result = fibo1(x); [L40] COND TRUE result == 1 [L41] CALL reach_error() [L4] __assert_fail("0", "fibo_2calls_2-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.3s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 83 SDtfs, 95 SDslu, 137 SDs, 0 SdLazy, 407 SolverSat, 48 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 53 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred 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, 8 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 4.6s InterpolantComputationTime, 101 NumberOfCodeBlocks, 101 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 69 ConstructedInterpolants, 0 QuantifiedInterpolants, 5351 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 8/8 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...