/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 SingleStatement --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 -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-c90d42b [2020-09-25 05:26:24,969 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 05:26:24,974 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 05:26:25,023 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 05:26:25,024 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 05:26:25,025 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 05:26:25,027 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 05:26:25,029 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 05:26:25,031 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 05:26:25,032 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 05:26:25,033 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 05:26:25,034 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 05:26:25,034 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 05:26:25,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 05:26:25,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 05:26:25,038 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 05:26:25,039 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 05:26:25,040 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 05:26:25,043 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 05:26:25,045 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 05:26:25,047 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 05:26:25,048 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 05:26:25,049 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 05:26:25,050 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 05:26:25,053 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 05:26:25,053 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 05:26:25,054 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 05:26:25,055 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 05:26:25,055 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 05:26:25,056 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 05:26:25,057 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 05:26:25,058 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 05:26:25,059 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 05:26:25,059 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 05:26:25,061 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 05:26:25,061 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 05:26:25,062 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 05:26:25,062 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 05:26:25,062 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 05:26:25,063 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 05:26:25,064 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 05:26:25,065 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-25 05:26:25,091 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 05:26:25,091 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 05:26:25,092 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 05:26:25,093 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 05:26:25,093 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 05:26:25,093 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 05:26:25,093 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 05:26:25,094 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 05:26:25,094 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 05:26:25,094 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 05:26:25,094 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 05:26:25,095 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 05:26:25,095 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 05:26:25,095 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 05:26:25,095 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 05:26:25,095 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 05:26:25,096 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 05:26:25,096 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 05:26:25,096 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 05:26:25,096 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 05:26:25,096 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 05:26:25,097 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 05:26:25,097 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 05:26:25,097 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 05:26:25,097 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 05:26:25,098 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 05:26:25,098 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 05:26:25,098 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 05:26:25,098 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 05:26:25,098 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 -> SingleStatement 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; 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; 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; 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; 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; 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; [2020-09-25 05:26:25,577 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 05:26:25,595 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 05:26:25,599 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 05:26:25,601 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 05:26:25,602 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 05:26:25,603 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-09-25 05:26:25,698 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cad1cccc9/cfd191062e2a4fd8bce8d521e26e9076/FLAG7e784c926 [2020-09-25 05:26:26,215 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 05:26:26,216 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-09-25 05:26:26,225 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cad1cccc9/cfd191062e2a4fd8bce8d521e26e9076/FLAG7e784c926 [2020-09-25 05:26:26,567 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cad1cccc9/cfd191062e2a4fd8bce8d521e26e9076 [2020-09-25 05:26:26,582 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 05:26:26,589 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 05:26:26,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 05:26:26,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 05:26:26,595 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 05:26:26,596 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,600 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42e25ac0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26, skipping insertion in model container [2020-09-25 05:26:26,601 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,610 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 05:26:26,635 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 05:26:26,837 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 05:26:26,842 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 05:26:26,857 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 05:26:26,872 INFO L208 MainTranslator]: Completed translation [2020-09-25 05:26:26,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26 WrapperNode [2020-09-25 05:26:26,872 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 05:26:26,873 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 05:26:26,873 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 05:26:26,873 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 05:26:26,888 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,888 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,894 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,894 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,898 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,901 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,902 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (1/1) ... [2020-09-25 05:26:26,903 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 05:26:26,904 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 05:26:26,904 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 05:26:26,904 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 05:26:26,905 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 05:26:27,070 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 05:26:27,070 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 05:26:27,070 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-09-25 05:26:27,071 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-09-25 05:26:27,071 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 05:26:27,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 05:26:27,071 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-09-25 05:26:27,071 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-09-25 05:26:27,072 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 05:26:27,072 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 05:26:27,072 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 05:26:27,265 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 05:26:27,266 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-25 05:26:27,270 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 05:26:27 BoogieIcfgContainer [2020-09-25 05:26:27,271 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 05:26:27,272 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 05:26:27,272 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 05:26:27,276 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 05:26:27,276 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 05:26:26" (1/3) ... [2020-09-25 05:26:27,277 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9d2a269 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 05:26:27, skipping insertion in model container [2020-09-25 05:26:27,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 05:26:26" (2/3) ... [2020-09-25 05:26:27,279 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9d2a269 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 05:26:27, skipping insertion in model container [2020-09-25 05:26:27,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 05:26:27" (3/3) ... [2020-09-25 05:26:27,282 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-09-25 05:26:27,295 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 05:26:27,305 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-09-25 05:26:27,329 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-09-25 05:26:27,359 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 05:26:27,360 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 05:26:27,360 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 05:26:27,360 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 05:26:27,360 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 05:26:27,361 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 05:26:27,361 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 05:26:27,361 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 05:26:27,381 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-09-25 05:26:27,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-25 05:26:27,388 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 05:26:27,389 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 05:26:27,389 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 05:26:27,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 05:26:27,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1612791331, now seen corresponding path program 1 times [2020-09-25 05:26:27,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 05:26:27,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317107156] [2020-09-25 05:26:27,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 05:26:27,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 05:26:27,541 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 05:26:27,633 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 05:26:27,633 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-09-25 05:26:27,633 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 05:26:27,634 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 110 [2020-09-25 05:26:27,636 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 05:26:27,637 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.4 [2020-09-25 05:26:27,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-09-25 05:26:27,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-09-25 05:26:27,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-09-25 05:26:27,638 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-09-25 05:26:27,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 05:26:27,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 05:26:27,839 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 05:26:27,842 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 05:26:27,842 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-25 05:26:27,842 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 05:26:27,842 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-09-25 05:26:27,843 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 05:26:27,843 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.4 [2020-09-25 05:26:27,843 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 05:26:27,843 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 05:26:27,844 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 05:26:27,844 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 05:26:27,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-25 05:26:27,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 05:26:27,857 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 05:26:27,869 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 05:26:27,869 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-25 05:26:27,869 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 05:26:27,870 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-09-25 05:26:27,870 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 05:26:27,870 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.4 [2020-09-25 05:26:27,871 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-25 05:26:27,871 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-09-25 05:26:27,871 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-25 05:26:27,871 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 05:26:27,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 05:26:27,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317107156] [2020-09-25 05:26:27,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 05:26:27,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-25 05:26:27,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68963360] [2020-09-25 05:26:27,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-25 05:26:27,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 05:26:27,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-25 05:26:27,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-25 05:26:27,944 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 8 states. [2020-09-25 05:26:28,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 05:26:28,179 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-09-25 05:26:28,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-25 05:26:28,182 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-09-25 05:26:28,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 05:26:28,194 INFO L225 Difference]: With dead ends: 43 [2020-09-25 05:26:28,195 INFO L226 Difference]: Without dead ends: 31 [2020-09-25 05:26:28,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2020-09-25 05:26:28,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-25 05:26:28,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-25 05:26:28,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-25 05:26:28,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-09-25 05:26:28,260 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 16 [2020-09-25 05:26:28,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 05:26:28,261 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-09-25 05:26:28,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-25 05:26:28,262 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-09-25 05:26:28,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-25 05:26:28,263 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 05:26:28,263 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 05:26:28,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 05:26:28,264 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 05:26:28,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 05:26:28,264 INFO L82 PathProgramCache]: Analyzing trace with hash 107301256, now seen corresponding path program 1 times [2020-09-25 05:26:28,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 05:26:28,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382978534] [2020-09-25 05:26:28,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 05:26:28,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-25 05:26:28,281 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-25 05:26:28,282 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-25 05:26:28,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 05:26:28,308 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 05:26:28 BoogieIcfgContainer [2020-09-25 05:26:28,308 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-25 05:26:28,312 INFO L168 Benchmark]: Toolchain (without parser) took 1726.52 ms. Allocated memory was 140.0 MB in the beginning and 201.3 MB in the end (delta: 61.3 MB). Free memory was 102.9 MB in the beginning and 118.8 MB in the end (delta: -15.9 MB). Peak memory consumption was 45.5 MB. Max. memory is 7.1 GB. [2020-09-25 05:26:28,314 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-25 05:26:28,315 INFO L168 Benchmark]: CACSL2BoogieTranslator took 282.67 ms. Allocated memory is still 140.0 MB. Free memory was 102.3 MB in the beginning and 93.3 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-09-25 05:26:28,316 INFO L168 Benchmark]: Boogie Preprocessor took 30.54 ms. Allocated memory is still 140.0 MB. Free memory was 93.3 MB in the beginning and 91.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-09-25 05:26:28,317 INFO L168 Benchmark]: RCFGBuilder took 366.82 ms. Allocated memory was 140.0 MB in the beginning and 201.3 MB in the end (delta: 61.3 MB). Free memory was 91.9 MB in the beginning and 168.8 MB in the end (delta: -76.9 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-09-25 05:26:28,318 INFO L168 Benchmark]: TraceAbstraction took 1036.44 ms. Allocated memory is still 201.3 MB. Free memory was 168.2 MB in the beginning and 118.8 MB in the end (delta: 49.4 MB). Peak memory consumption was 49.4 MB. Max. memory is 7.1 GB. [2020-09-25 05:26:28,327 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 282.67 ms. Allocated memory is still 140.0 MB. Free memory was 102.3 MB in the beginning and 93.3 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.54 ms. Allocated memory is still 140.0 MB. Free memory was 93.3 MB in the beginning and 91.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 366.82 ms. Allocated memory was 140.0 MB in the beginning and 201.3 MB in the end (delta: 61.3 MB). Free memory was 91.9 MB in the beginning and 168.8 MB in the end (delta: -76.9 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1036.44 ms. Allocated memory is still 201.3 MB. Free memory was 168.2 MB in the beginning and 118.8 MB in the end (delta: 49.4 MB). Peak memory consumption was 49.4 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, 29 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.9s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 17 SDtfs, 11 SDslu, 92 SDs, 0 SdLazy, 56 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred in iteration=1, 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, 0.3s InterpolantComputationTime, 38 NumberOfCodeBlocks, 38 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 15 ConstructedInterpolants, 0 QuantifiedInterpolants, 495 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...