/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 --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=BIGGEST --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 -i ../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-12 18:16:48,161 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-12 18:16:48,164 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-12 18:16:48,187 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-12 18:16:48,188 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-12 18:16:48,189 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-12 18:16:48,190 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-12 18:16:48,192 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-12 18:16:48,193 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-12 18:16:48,194 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-12 18:16:48,195 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-12 18:16:48,196 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-12 18:16:48,197 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-12 18:16:48,198 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-12 18:16:48,199 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-12 18:16:48,200 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-12 18:16:48,200 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-12 18:16:48,201 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-12 18:16:48,203 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-12 18:16:48,205 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-12 18:16:48,206 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-12 18:16:48,207 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-12 18:16:48,208 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-12 18:16:48,209 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-12 18:16:48,211 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-12 18:16:48,212 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-12 18:16:48,212 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-12 18:16:48,213 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-12 18:16:48,213 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-12 18:16:48,214 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-12 18:16:48,214 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-12 18:16:48,215 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-12 18:16:48,216 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-12 18:16:48,216 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-12 18:16:48,217 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-12 18:16:48,217 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-12 18:16:48,218 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-12 18:16:48,218 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-12 18:16:48,219 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-12 18:16:48,219 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-12 18:16:48,220 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-12 18:16:48,221 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 [2020-10-12 18:16:48,243 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-12 18:16:48,243 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-12 18:16:48,244 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-12 18:16:48,244 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-12 18:16:48,245 INFO L138 SettingsManager]: * Use SBE=true [2020-10-12 18:16:48,245 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-12 18:16:48,245 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-12 18:16:48,245 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-12 18:16:48,245 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-12 18:16:48,246 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-12 18:16:48,246 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-12 18:16:48,246 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-12 18:16:48,246 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-12 18:16:48,246 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-12 18:16:48,247 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-12 18:16:48,247 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-12 18:16:48,247 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-12 18:16:48,247 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-12 18:16:48,247 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-12 18:16:48,247 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-12 18:16:48,248 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-12 18:16:48,248 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-12 18:16:48,248 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-12 18:16:48,248 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-12 18:16:48,248 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-12 18:16:48,249 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-12 18:16:48,249 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-12 18:16:48,249 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-12 18:16:48,249 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-12 18:16:48,249 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.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=BIGGEST;log-additional-information=true;unknown-allowed=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=BIGGEST;log-additional-information=true;unknown-allowed=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=BIGGEST;log-additional-information=true;unknown-allowed=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=BIGGEST;log-additional-information=true;unknown-allowed=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=BIGGEST;log-additional-information=true;unknown-allowed=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=BIGGEST;log-additional-information=true;unknown-allowed=true; [2020-10-12 18:16:48,579 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-12 18:16:48,590 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-12 18:16:48,594 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-12 18:16:48,595 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-12 18:16:48,596 INFO L275 PluginConnector]: CDTParser initialized [2020-10-12 18:16:48,597 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-10-12 18:16:48,669 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fb84b45d3/e950c3b86cfa45b0ba0944ac3d98bdf0/FLAG4331fd239 [2020-10-12 18:16:49,183 INFO L306 CDTParser]: Found 1 translation units. [2020-10-12 18:16:49,183 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-10-12 18:16:49,190 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fb84b45d3/e950c3b86cfa45b0ba0944ac3d98bdf0/FLAG4331fd239 [2020-10-12 18:16:49,537 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fb84b45d3/e950c3b86cfa45b0ba0944ac3d98bdf0 [2020-10-12 18:16:49,545 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-12 18:16:49,547 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-12 18:16:49,548 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-12 18:16:49,548 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-12 18:16:49,552 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-12 18:16:49,553 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,556 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@233ca229 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49, skipping insertion in model container [2020-10-12 18:16:49,556 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,564 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-12 18:16:49,581 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-12 18:16:49,718 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 18:16:49,723 INFO L203 MainTranslator]: Completed pre-run [2020-10-12 18:16:49,737 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 18:16:49,749 INFO L208 MainTranslator]: Completed translation [2020-10-12 18:16:49,749 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49 WrapperNode [2020-10-12 18:16:49,750 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-12 18:16:49,750 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-12 18:16:49,750 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-12 18:16:49,750 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-12 18:16:49,760 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,761 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,766 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,766 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,856 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,859 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,860 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (1/1) ... [2020-10-12 18:16:49,861 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-12 18:16:49,862 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-12 18:16:49,862 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-12 18:16:49,862 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-12 18:16:49,863 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (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 [2020-10-12 18:16:49,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-12 18:16:49,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-12 18:16:49,922 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-10-12 18:16:49,922 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-10-12 18:16:49,922 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-12 18:16:49,922 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-12 18:16:49,923 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-10-12 18:16:49,923 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-10-12 18:16:49,923 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-12 18:16:49,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-12 18:16:49,924 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-12 18:16:50,084 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-12 18:16:50,084 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-12 18:16:50,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 06:16:50 BoogieIcfgContainer [2020-10-12 18:16:50,088 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-12 18:16:50,090 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-12 18:16:50,090 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-12 18:16:50,093 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-12 18:16:50,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.10 06:16:49" (1/3) ... [2020-10-12 18:16:50,094 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75362474 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 06:16:50, skipping insertion in model container [2020-10-12 18:16:50,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 06:16:49" (2/3) ... [2020-10-12 18:16:50,095 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75362474 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 06:16:50, skipping insertion in model container [2020-10-12 18:16:50,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 06:16:50" (3/3) ... [2020-10-12 18:16:50,096 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-10-12 18:16:50,106 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-12 18:16:50,113 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-10-12 18:16:50,127 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-10-12 18:16:50,150 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-12 18:16:50,151 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-12 18:16:50,151 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-12 18:16:50,151 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-12 18:16:50,151 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-12 18:16:50,151 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-12 18:16:50,152 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-12 18:16:50,152 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-12 18:16:50,167 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-10-12 18:16:50,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-12 18:16:50,173 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 18:16:50,174 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 18:16:50,174 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 18:16:50,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 18:16:50,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-10-12 18:16:50,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 18:16:50,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455559609] [2020-10-12 18:16:50,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 18:16:50,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 18:16:50,301 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 18:16:50,405 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 18:16:50,405 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-12 18:16:50,405 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 18:16:50,406 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 118 [2020-10-12 18:16:50,408 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 18:16:50,408 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 18:16:50,408 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 18:16:50,408 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-12 18:16:50,409 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-12 18:16:50,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 18:16:50,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 18:16:50,544 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 18:16:50,547 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 18:16:50,548 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-12 18:16:50,550 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 18:16:50,550 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-12 18:16:50,551 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 18:16:50,551 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 18:16:50,552 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 18:16:50,552 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 18:16:50,552 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 18:16:50,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-12 18:16:50,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 18:16:50,578 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 18:16:50,611 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 18:16:50,611 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-12 18:16:50,612 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 18:16:50,612 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 35 [2020-10-12 18:16:50,617 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 18:16:50,618 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-12 18:16:50,618 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-10-12 18:16:50,619 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-12 18:16:50,619 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-12 18:16:50,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 18:16:50,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455559609] [2020-10-12 18:16:50,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 18:16:50,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-12 18:16:50,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26748266] [2020-10-12 18:16:50,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 18:16:50,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 18:16:50,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 18:16:50,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-10-12 18:16:50,714 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-10-12 18:16:50,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 18:16:50,828 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-10-12 18:16:50,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-12 18:16:50,830 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-10-12 18:16:50,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 18:16:50,840 INFO L225 Difference]: With dead ends: 34 [2020-10-12 18:16:50,841 INFO L226 Difference]: Without dead ends: 22 [2020-10-12 18:16:50,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-10-12 18:16:50,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-10-12 18:16:50,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-10-12 18:16:50,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-10-12 18:16:50,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-10-12 18:16:50,883 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-10-12 18:16:50,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 18:16:50,883 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-10-12 18:16:50,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-12 18:16:50,884 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-10-12 18:16:50,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-12 18:16:50,885 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 18:16:50,885 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 18:16:50,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-12 18:16:50,886 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 18:16:50,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 18:16:50,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-10-12 18:16:50,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 18:16:50,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [513834939] [2020-10-12 18:16:50,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 18:16:50,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-12 18:16:50,899 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-12 18:16:50,899 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-10-12 18:16:50,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-12 18:16:50,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.10 06:16:50 BoogieIcfgContainer [2020-10-12 18:16:50,920 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-12 18:16:50,923 INFO L168 Benchmark]: Toolchain (without parser) took 1375.52 ms. Allocated memory was 145.2 MB in the beginning and 200.8 MB in the end (delta: 55.6 MB). Free memory was 101.4 MB in the beginning and 125.3 MB in the end (delta: -23.9 MB). Peak memory consumption was 31.7 MB. Max. memory is 7.1 GB. [2020-10-12 18:16:50,924 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 145.2 MB. Free memory was 119.8 MB in the beginning and 119.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-10-12 18:16:50,925 INFO L168 Benchmark]: CACSL2BoogieTranslator took 202.08 ms. Allocated memory is still 145.2 MB. Free memory was 101.2 MB in the beginning and 92.1 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-10-12 18:16:50,926 INFO L168 Benchmark]: Boogie Preprocessor took 111.40 ms. Allocated memory was 145.2 MB in the beginning and 200.8 MB in the end (delta: 55.6 MB). Free memory was 92.1 MB in the beginning and 179.8 MB in the end (delta: -87.6 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-10-12 18:16:50,927 INFO L168 Benchmark]: RCFGBuilder took 226.51 ms. Allocated memory is still 200.8 MB. Free memory was 179.8 MB in the beginning and 167.7 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-10-12 18:16:50,928 INFO L168 Benchmark]: TraceAbstraction took 830.61 ms. Allocated memory is still 200.8 MB. Free memory was 167.0 MB in the beginning and 125.3 MB in the end (delta: 41.8 MB). Peak memory consumption was 41.8 MB. Max. memory is 7.1 GB. [2020-10-12 18:16:50,933 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 145.2 MB. Free memory was 119.8 MB in the beginning and 119.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 202.08 ms. Allocated memory is still 145.2 MB. Free memory was 101.2 MB in the beginning and 92.1 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.40 ms. Allocated memory was 145.2 MB in the beginning and 200.8 MB in the end (delta: 55.6 MB). Free memory was 92.1 MB in the beginning and 179.8 MB in the end (delta: -87.6 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 226.51 ms. Allocated memory is still 200.8 MB. Free memory was 179.8 MB in the beginning and 167.7 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 830.61 ms. Allocated memory is still 200.8 MB. Free memory was 167.0 MB in the beginning and 125.3 MB in the end (delta: 41.8 MB). Peak memory consumption was 41.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L21] CALL f(4) [L7] COND FALSE !(n<3) [L8] n-- [L9] CALL f2(n) [L14] COND FALSE !(n<3) [L15] n-- [L16] CALL f(n) [L7] COND TRUE n<3 [L16] RET f(n) [L17] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 3 SDslu, 48 SDs, 0 SdLazy, 28 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 29 NumberOfCodeBlocks, 29 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 12 ConstructedInterpolants, 0 QuantifiedInterpolants, 288 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 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...