/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=1.0 --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 08:53:07,245 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 08:53:07,249 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 08:53:07,275 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 08:53:07,275 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 08:53:07,276 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 08:53:07,278 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 08:53:07,280 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 08:53:07,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 08:53:07,283 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 08:53:07,284 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 08:53:07,285 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 08:53:07,286 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 08:53:07,287 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 08:53:07,288 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 08:53:07,290 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 08:53:07,291 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 08:53:07,292 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 08:53:07,294 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 08:53:07,296 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 08:53:07,298 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 08:53:07,300 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 08:53:07,301 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 08:53:07,302 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 08:53:07,305 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 08:53:07,306 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 08:53:07,306 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 08:53:07,307 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 08:53:07,308 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 08:53:07,309 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 08:53:07,309 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 08:53:07,310 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 08:53:07,311 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 08:53:07,312 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 08:53:07,313 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 08:53:07,313 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 08:53:07,314 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 08:53:07,315 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 08:53:07,315 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 08:53:07,316 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 08:53:07,317 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 08:53:07,318 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 08:53:07,346 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 08:53:07,347 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 08:53:07,348 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 08:53:07,348 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 08:53:07,348 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 08:53:07,349 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 08:53:07,349 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 08:53:07,349 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 08:53:07,349 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 08:53:07,349 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 08:53:07,350 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 08:53:07,350 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 08:53:07,350 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 08:53:07,350 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 08:53:07,350 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 08:53:07,351 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 08:53:07,351 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 08:53:07,351 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 08:53:07,351 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 08:53:07,351 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 08:53:07,352 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 08:53:07,352 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 08:53:07,352 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 08:53:07,352 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 08:53:07,353 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 08:53:07,353 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 08:53:07,353 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 08:53:07,353 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 08:53:07,353 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 08:53:07,354 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=1.0;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=1.0;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=1.0;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=1.0;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=1.0;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=1.0;log-additional-information=true; [2020-09-25 08:53:07,805 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 08:53:07,825 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 08:53:07,830 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 08:53:07,831 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 08:53:07,832 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 08:53:07,833 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-09-25 08:53:07,925 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/da8eb8c0c/e5d474aedaac46a98e2ed4e5cf71f842/FLAGff9f51885 [2020-09-25 08:53:08,420 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 08:53:08,421 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-09-25 08:53:08,430 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/da8eb8c0c/e5d474aedaac46a98e2ed4e5cf71f842/FLAGff9f51885 [2020-09-25 08:53:08,782 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/da8eb8c0c/e5d474aedaac46a98e2ed4e5cf71f842 [2020-09-25 08:53:08,794 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 08:53:08,800 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 08:53:08,801 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 08:53:08,802 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 08:53:08,806 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 08:53:08,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 08:53:08" (1/1) ... [2020-09-25 08:53:08,812 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d1c6851 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:08, skipping insertion in model container [2020-09-25 08:53:08,813 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 08:53:08" (1/1) ... [2020-09-25 08:53:08,823 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 08:53:08,853 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 08:53:09,108 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 08:53:09,113 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 08:53:09,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 08:53:09,141 INFO L208 MainTranslator]: Completed translation [2020-09-25 08:53:09,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09 WrapperNode [2020-09-25 08:53:09,142 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 08:53:09,143 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 08:53:09,143 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 08:53:09,143 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 08:53:09,156 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (1/1) ... [2020-09-25 08:53:09,156 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (1/1) ... [2020-09-25 08:53:09,244 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (1/1) ... [2020-09-25 08:53:09,245 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (1/1) ... [2020-09-25 08:53:09,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (1/1) ... [2020-09-25 08:53:09,251 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (1/1) ... [2020-09-25 08:53:09,252 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (1/1) ... [2020-09-25 08:53:09,253 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 08:53:09,254 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 08:53:09,254 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 08:53:09,254 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 08:53:09,255 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (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 08:53:09,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 08:53:09,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 08:53:09,328 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-09-25 08:53:09,328 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-09-25 08:53:09,328 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 08:53:09,329 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 08:53:09,329 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-09-25 08:53:09,329 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-09-25 08:53:09,329 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 08:53:09,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 08:53:09,330 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 08:53:09,509 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 08:53:09,509 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-25 08:53:09,515 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 08:53:09 BoogieIcfgContainer [2020-09-25 08:53:09,515 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 08:53:09,526 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 08:53:09,526 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 08:53:09,532 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 08:53:09,532 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 08:53:08" (1/3) ... [2020-09-25 08:53:09,534 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@529546a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 08:53:09, skipping insertion in model container [2020-09-25 08:53:09,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:53:09" (2/3) ... [2020-09-25 08:53:09,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@529546a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 08:53:09, skipping insertion in model container [2020-09-25 08:53:09,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 08:53:09" (3/3) ... [2020-09-25 08:53:09,552 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-09-25 08:53:09,580 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 08:53:09,605 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-09-25 08:53:09,630 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-09-25 08:53:09,661 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 08:53:09,662 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 08:53:09,662 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 08:53:09,662 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 08:53:09,662 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 08:53:09,663 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 08:53:09,663 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 08:53:09,663 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 08:53:09,681 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-09-25 08:53:09,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-25 08:53:09,688 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 08:53:09,689 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 08:53:09,689 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 08:53:09,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 08:53:09,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1612791331, now seen corresponding path program 1 times [2020-09-25 08:53:09,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 08:53:09,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1037333253] [2020-09-25 08:53:09,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 08:53:09,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 08:53:09,843 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:53:09,938 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 08:53:09,939 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-09-25 08:53:09,939 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 08:53:09,939 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 115 [2020-09-25 08:53:09,942 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 08:53:09,942 FATAL L256 erpolLogProxyWrapper]: Tolerance: 1.0 [2020-09-25 08:53:09,943 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-09-25 08:53:09,943 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-09-25 08:53:09,943 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-09-25 08:53:09,943 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-09-25 08:53:10,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 08:53:10,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 08:53:10,070 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:53:10,072 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 08:53:10,072 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-25 08:53:10,073 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 08:53:10,073 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-09-25 08:53:10,073 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 08:53:10,073 FATAL L256 erpolLogProxyWrapper]: Tolerance: 1.0 [2020-09-25 08:53:10,074 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 08:53:10,074 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 08:53:10,074 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 08:53:10,074 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 08:53:10,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-25 08:53:10,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 08:53:10,088 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:53:10,101 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 08:53:10,101 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-25 08:53:10,101 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 08:53:10,102 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 16 [2020-09-25 08:53:10,102 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 08:53:10,102 FATAL L256 erpolLogProxyWrapper]: Tolerance: 1.0 [2020-09-25 08:53:10,103 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-25 08:53:10,103 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-09-25 08:53:10,103 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-25 08:53:10,104 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 08:53:10,151 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 08:53:10,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1037333253] [2020-09-25 08:53:10,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 08:53:10,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-25 08:53:10,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15487793] [2020-09-25 08:53:10,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-25 08:53:10,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 08:53:10,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-25 08:53:10,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-25 08:53:10,183 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 8 states. [2020-09-25 08:53:10,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 08:53:10,392 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-09-25 08:53:10,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-25 08:53:10,394 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-09-25 08:53:10,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 08:53:10,408 INFO L225 Difference]: With dead ends: 43 [2020-09-25 08:53:10,408 INFO L226 Difference]: Without dead ends: 31 [2020-09-25 08:53:10,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2020-09-25 08:53:10,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-25 08:53:10,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-25 08:53:10,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-25 08:53:10,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-09-25 08:53:10,464 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 16 [2020-09-25 08:53:10,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 08:53:10,465 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-09-25 08:53:10,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-25 08:53:10,465 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-09-25 08:53:10,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-25 08:53:10,466 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 08:53:10,467 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 08:53:10,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 08:53:10,467 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 08:53:10,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 08:53:10,468 INFO L82 PathProgramCache]: Analyzing trace with hash 107301256, now seen corresponding path program 1 times [2020-09-25 08:53:10,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 08:53:10,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2087560412] [2020-09-25 08:53:10,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 08:53:10,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-25 08:53:10,482 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-25 08:53:10,482 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-25 08:53:10,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 08:53:10,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 08:53:10 BoogieIcfgContainer [2020-09-25 08:53:10,509 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-25 08:53:10,513 INFO L168 Benchmark]: Toolchain (without parser) took 1715.29 ms. Allocated memory was 140.5 MB in the beginning and 200.8 MB in the end (delta: 60.3 MB). Free memory was 100.8 MB in the beginning and 117.3 MB in the end (delta: -16.5 MB). Peak memory consumption was 43.8 MB. Max. memory is 7.1 GB. [2020-09-25 08:53:10,514 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 140.5 MB. Free memory was 119.5 MB in the beginning and 119.0 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-09-25 08:53:10,515 INFO L168 Benchmark]: CACSL2BoogieTranslator took 341.05 ms. Allocated memory is still 140.5 MB. Free memory was 100.3 MB in the beginning and 91.5 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2020-09-25 08:53:10,516 INFO L168 Benchmark]: Boogie Preprocessor took 110.72 ms. Allocated memory was 140.5 MB in the beginning and 200.8 MB in the end (delta: 60.3 MB). Free memory was 91.5 MB in the beginning and 179.5 MB in the end (delta: -88.1 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-09-25 08:53:10,517 INFO L168 Benchmark]: RCFGBuilder took 261.96 ms. Allocated memory is still 200.8 MB. Free memory was 179.5 MB in the beginning and 166.9 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-09-25 08:53:10,517 INFO L168 Benchmark]: TraceAbstraction took 983.34 ms. Allocated memory is still 200.8 MB. Free memory was 166.9 MB in the beginning and 117.3 MB in the end (delta: 49.7 MB). Peak memory consumption was 49.7 MB. Max. memory is 7.1 GB. [2020-09-25 08:53:10,522 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 140.5 MB. Free memory was 119.5 MB in the beginning and 119.0 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 341.05 ms. Allocated memory is still 140.5 MB. Free memory was 100.3 MB in the beginning and 91.5 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 110.72 ms. Allocated memory was 140.5 MB in the beginning and 200.8 MB in the end (delta: 60.3 MB). Free memory was 91.5 MB in the beginning and 179.5 MB in the end (delta: -88.1 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 261.96 ms. Allocated memory is still 200.8 MB. Free memory was 179.5 MB in the beginning and 166.9 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 983.34 ms. Allocated memory is still 200.8 MB. Free memory was 166.9 MB in the beginning and 117.3 MB in the end (delta: 49.7 MB). Peak memory consumption was 49.7 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: 0.8s, 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, 0.1s 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...