/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 --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 [2020-10-14 07:26:39,457 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-14 07:26:39,460 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-14 07:26:39,484 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-14 07:26:39,484 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-14 07:26:39,485 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-14 07:26:39,487 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-14 07:26:39,488 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-14 07:26:39,490 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-14 07:26:39,491 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-14 07:26:39,492 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-14 07:26:39,493 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-14 07:26:39,493 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-14 07:26:39,494 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-14 07:26:39,498 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-14 07:26:39,499 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-14 07:26:39,500 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-14 07:26:39,500 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-14 07:26:39,502 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-14 07:26:39,504 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-14 07:26:39,505 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-14 07:26:39,506 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-14 07:26:39,507 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-14 07:26:39,508 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-14 07:26:39,511 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-14 07:26:39,511 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-14 07:26:39,511 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-14 07:26:39,512 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-14 07:26:39,513 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-14 07:26:39,514 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-14 07:26:39,514 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-14 07:26:39,514 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-14 07:26:39,515 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-14 07:26:39,516 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-14 07:26:39,517 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-14 07:26:39,517 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-14 07:26:39,518 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-14 07:26:39,518 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-14 07:26:39,518 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-14 07:26:39,519 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-14 07:26:39,520 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-14 07:26:39,521 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 [2020-10-14 07:26:39,543 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-14 07:26:39,543 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-14 07:26:39,544 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-14 07:26:39,544 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-14 07:26:39,544 INFO L138 SettingsManager]: * Use SBE=true [2020-10-14 07:26:39,545 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-14 07:26:39,545 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-14 07:26:39,545 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-14 07:26:39,545 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-14 07:26:39,546 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-14 07:26:39,546 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-14 07:26:39,546 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-14 07:26:39,546 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-14 07:26:39,546 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-14 07:26:39,547 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-14 07:26:39,547 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-14 07:26:39,547 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-14 07:26:39,547 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-14 07:26:39,547 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-14 07:26:39,548 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-14 07:26:39,548 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-14 07:26:39,548 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-14 07:26:39,548 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-14 07:26:39,548 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-14 07:26:39,549 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-14 07:26:39,549 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-14 07:26:39,549 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-14 07:26:39,549 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-14 07:26:39,549 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-14 07:26:39,549 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=WIDESTAMONGSMALL;tolerance=0.4;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=WIDESTAMONGSMALL;tolerance=0.4;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=WIDESTAMONGSMALL;tolerance=0.4;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=WIDESTAMONGSMALL;tolerance=0.4;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=WIDESTAMONGSMALL;tolerance=0.4;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=WIDESTAMONGSMALL;tolerance=0.4;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=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true;unknown-allowed=true; [2020-10-14 07:26:39,861 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-14 07:26:39,879 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-14 07:26:39,883 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-14 07:26:39,885 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-14 07:26:39,886 INFO L275 PluginConnector]: CDTParser initialized [2020-10-14 07:26:39,886 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-10-14 07:26:39,956 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfbcfbd16/18cb12872dca4e8ea2cd38e0c42e1603/FLAGc5525de85 [2020-10-14 07:26:40,381 INFO L306 CDTParser]: Found 1 translation units. [2020-10-14 07:26:40,382 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-10-14 07:26:40,387 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfbcfbd16/18cb12872dca4e8ea2cd38e0c42e1603/FLAGc5525de85 [2020-10-14 07:26:40,808 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfbcfbd16/18cb12872dca4e8ea2cd38e0c42e1603 [2020-10-14 07:26:40,819 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-14 07:26:40,820 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-14 07:26:40,821 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-14 07:26:40,822 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-14 07:26:40,825 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-14 07:26:40,826 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 07:26:40" (1/1) ... [2020-10-14 07:26:40,829 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16febf07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:40, skipping insertion in model container [2020-10-14 07:26:40,829 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 07:26:40" (1/1) ... [2020-10-14 07:26:40,836 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-14 07:26:40,855 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-14 07:26:41,007 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-14 07:26:41,011 INFO L203 MainTranslator]: Completed pre-run [2020-10-14 07:26:41,026 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-14 07:26:41,040 INFO L208 MainTranslator]: Completed translation [2020-10-14 07:26:41,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41 WrapperNode [2020-10-14 07:26:41,041 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-14 07:26:41,042 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-14 07:26:41,042 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-14 07:26:41,042 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-14 07:26:41,055 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (1/1) ... [2020-10-14 07:26:41,056 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (1/1) ... [2020-10-14 07:26:41,061 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (1/1) ... [2020-10-14 07:26:41,061 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (1/1) ... [2020-10-14 07:26:41,152 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (1/1) ... [2020-10-14 07:26:41,156 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (1/1) ... [2020-10-14 07:26:41,157 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (1/1) ... [2020-10-14 07:26:41,158 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-14 07:26:41,158 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-14 07:26:41,159 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-14 07:26:41,159 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-14 07:26:41,159 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (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 [2020-10-14 07:26:41,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-14 07:26:41,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-14 07:26:41,234 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-10-14 07:26:41,234 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-10-14 07:26:41,234 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-14 07:26:41,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-14 07:26:41,236 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-10-14 07:26:41,237 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-10-14 07:26:41,237 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-14 07:26:41,237 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-14 07:26:41,237 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-14 07:26:41,400 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-14 07:26:41,400 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-14 07:26:41,404 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 07:26:41 BoogieIcfgContainer [2020-10-14 07:26:41,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-14 07:26:41,405 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-14 07:26:41,405 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-14 07:26:41,408 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-14 07:26:41,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 07:26:40" (1/3) ... [2020-10-14 07:26:41,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fc9f17c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 07:26:41, skipping insertion in model container [2020-10-14 07:26:41,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 07:26:41" (2/3) ... [2020-10-14 07:26:41,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fc9f17c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 07:26:41, skipping insertion in model container [2020-10-14 07:26:41,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 07:26:41" (3/3) ... [2020-10-14 07:26:41,412 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-10-14 07:26:41,420 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-14 07:26:41,427 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-10-14 07:26:41,437 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-10-14 07:26:41,460 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-14 07:26:41,460 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-14 07:26:41,460 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-14 07:26:41,461 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-14 07:26:41,461 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-14 07:26:41,461 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-14 07:26:41,461 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-14 07:26:41,461 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-14 07:26:41,479 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-10-14 07:26:41,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-14 07:26:41,486 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 07:26:41,487 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 07:26:41,487 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 07:26:41,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 07:26:41,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-10-14 07:26:41,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 07:26:41,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579148441] [2020-10-14 07:26:41,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 07:26:41,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 07:26:41,613 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 07:26:41,724 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 07:26:41,724 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-14 07:26:41,725 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 07:26:41,728 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 125 [2020-10-14 07:26:41,733 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-14 07:26:41,734 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.4 [2020-10-14 07:26:41,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-14 07:26:41,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-14 07:26:41,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-14 07:26:41,734 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-14 07:26:41,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 07:26:41,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 07:26:41,797 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 07:26:41,799 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 07:26:41,800 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 07:26:41,800 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 07:26:41,800 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-14 07:26:41,800 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-14 07:26:41,801 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.4 [2020-10-14 07:26:41,801 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 07:26:41,801 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 07:26:41,801 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 07:26:41,802 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 07:26:41,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-14 07:26:41,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 07:26:41,812 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 07:26:41,825 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 07:26:41,826 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-14 07:26:41,826 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 07:26:41,826 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 16 [2020-10-14 07:26:41,826 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-14 07:26:41,827 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.4 [2020-10-14 07:26:41,827 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-14 07:26:41,827 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-10-14 07:26:41,827 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-14 07:26:41,828 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 07:26:41,870 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 07:26:41,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1579148441] [2020-10-14 07:26:41,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-14 07:26:41,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-14 07:26:41,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858092709] [2020-10-14 07:26:41,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-14 07:26:41,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 07:26:41,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-14 07:26:41,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-10-14 07:26:41,904 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-10-14 07:26:42,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 07:26:42,031 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-10-14 07:26:42,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-14 07:26:42,034 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-10-14 07:26:42,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 07:26:42,045 INFO L225 Difference]: With dead ends: 34 [2020-10-14 07:26:42,046 INFO L226 Difference]: Without dead ends: 22 [2020-10-14 07:26:42,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-10-14 07:26:42,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-10-14 07:26:42,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-10-14 07:26:42,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-10-14 07:26:42,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-10-14 07:26:42,093 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-10-14 07:26:42,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 07:26:42,094 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-10-14 07:26:42,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-14 07:26:42,095 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-10-14 07:26:42,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-14 07:26:42,095 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 07:26:42,096 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 07:26:42,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-14 07:26:42,097 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 07:26:42,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 07:26:42,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-10-14 07:26:42,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 07:26:42,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047873958] [2020-10-14 07:26:42,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 07:26:42,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-14 07:26:42,110 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-14 07:26:42,110 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-10-14 07:26:42,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-14 07:26:42,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.10 07:26:42 BoogieIcfgContainer [2020-10-14 07:26:42,132 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-14 07:26:42,135 INFO L168 Benchmark]: Toolchain (without parser) took 1313.57 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 103.0 MB in the beginning and 127.5 MB in the end (delta: -24.6 MB). Peak memory consumption was 31.5 MB. Max. memory is 7.1 GB. [2020-10-14 07:26:42,136 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 147.3 MB. Free memory was 121.9 MB in the beginning and 121.4 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB. [2020-10-14 07:26:42,138 INFO L168 Benchmark]: CACSL2BoogieTranslator took 220.17 ms. Allocated memory is still 147.3 MB. Free memory was 102.5 MB in the beginning and 93.8 MB in the end (delta: 8.7 MB). Peak memory consumption was 8.7 MB. Max. memory is 7.1 GB. [2020-10-14 07:26:42,139 INFO L168 Benchmark]: Boogie Preprocessor took 116.09 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 93.8 MB in the beginning and 182.1 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-10-14 07:26:42,140 INFO L168 Benchmark]: RCFGBuilder took 246.01 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 170.1 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-10-14 07:26:42,141 INFO L168 Benchmark]: TraceAbstraction took 726.53 ms. Allocated memory is still 203.4 MB. Free memory was 170.1 MB in the beginning and 127.5 MB in the end (delta: 42.5 MB). Peak memory consumption was 42.5 MB. Max. memory is 7.1 GB. [2020-10-14 07:26:42,146 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 147.3 MB. Free memory was 121.9 MB in the beginning and 121.4 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 220.17 ms. Allocated memory is still 147.3 MB. Free memory was 102.5 MB in the beginning and 93.8 MB in the end (delta: 8.7 MB). Peak memory consumption was 8.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 116.09 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 93.8 MB in the beginning and 182.1 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 246.01 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 170.1 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 726.53 ms. Allocated memory is still 203.4 MB. Free memory was 170.1 MB in the beginning and 127.5 MB in the end (delta: 42.5 MB). Peak memory consumption was 42.5 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: 0.6s, 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, 0.0s 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, 0.2s 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...