/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 --traceabstraction.use.minimal.unsat.core.enumeration false -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 0.1.25-177f698 [2020-08-21 13:16:56,737 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 13:16:56,741 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 13:16:56,785 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 13:16:56,786 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 13:16:56,796 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 13:16:56,800 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 13:16:56,804 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 13:16:56,807 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 13:16:56,810 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 13:16:56,811 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 13:16:56,813 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 13:16:56,813 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 13:16:56,817 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 13:16:56,819 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 13:16:56,821 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 13:16:56,823 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 13:16:56,824 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 13:16:56,825 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 13:16:56,833 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 13:16:56,836 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 13:16:56,837 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 13:16:56,838 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 13:16:56,839 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 13:16:56,855 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 13:16:56,856 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 13:16:56,856 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 13:16:56,857 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 13:16:56,857 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 13:16:56,861 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 13:16:56,862 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 13:16:56,862 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 13:16:56,867 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 13:16:56,867 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 13:16:56,872 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 13:16:56,872 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 13:16:56,873 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 13:16:56,873 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 13:16:56,873 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 13:16:56,874 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 13:16:56,876 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 13:16:56,877 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 [2020-08-21 13:16:56,919 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 13:16:56,920 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 13:16:56,922 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 13:16:56,922 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 13:16:56,923 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 13:16:56,923 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 13:16:56,923 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 13:16:56,924 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 13:16:56,924 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 13:16:56,924 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 13:16:56,925 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 13:16:56,925 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 13:16:56,926 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 13:16:56,926 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 13:16:56,926 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 13:16:56,926 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 13:16:56,927 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 13:16:56,927 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 13:16:56,927 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 13:16:56,927 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 13:16:56,928 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 13:16:56,928 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 13:16:56,928 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 13:16:56,928 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 13:16:56,929 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 13:16:56,929 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 13:16:56,929 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 13:16:56,929 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 13:16:56,929 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 13:16:56,929 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.traceabstraction: Use minimal unsat core enumeration -> false [2020-08-21 13:16:57,246 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 13:16:57,268 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 13:16:57,272 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 13:16:57,274 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 13:16:57,275 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 13:16:57,276 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-08-21 13:16:57,356 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a2a2fc751/80025a5754a649f7b3c1ef3a296a826b/FLAGa5570253a [2020-08-21 13:16:57,876 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 13:16:57,876 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-08-21 13:16:57,883 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a2a2fc751/80025a5754a649f7b3c1ef3a296a826b/FLAGa5570253a [2020-08-21 13:16:58,231 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a2a2fc751/80025a5754a649f7b3c1ef3a296a826b [2020-08-21 13:16:58,240 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 13:16:58,242 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 13:16:58,243 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 13:16:58,243 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 13:16:58,247 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 13:16:58,248 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,251 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76095f59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58, skipping insertion in model container [2020-08-21 13:16:58,251 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,259 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 13:16:58,276 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 13:16:58,459 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:16:58,464 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 13:16:58,479 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:16:58,494 INFO L208 MainTranslator]: Completed translation [2020-08-21 13:16:58,494 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58 WrapperNode [2020-08-21 13:16:58,495 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 13:16:58,496 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 13:16:58,496 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 13:16:58,496 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 13:16:58,506 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,507 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,606 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,606 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,613 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,616 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,617 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (1/1) ... [2020-08-21 13:16:58,620 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 13:16:58,621 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 13:16:58,621 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 13:16:58,621 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 13:16:58,622 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (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 [2020-08-21 13:16:58,682 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 13:16:58,682 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 13:16:58,682 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-08-21 13:16:58,682 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-08-21 13:16:58,683 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 13:16:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 13:16:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-08-21 13:16:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-08-21 13:16:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 13:16:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 13:16:58,684 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 13:16:58,861 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 13:16:58,861 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 13:16:58,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:16:58 BoogieIcfgContainer [2020-08-21 13:16:58,866 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 13:16:58,867 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 13:16:58,867 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 13:16:58,871 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 13:16:58,871 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 01:16:58" (1/3) ... [2020-08-21 13:16:58,872 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@757782a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:16:58, skipping insertion in model container [2020-08-21 13:16:58,872 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:16:58" (2/3) ... [2020-08-21 13:16:58,873 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@757782a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:16:58, skipping insertion in model container [2020-08-21 13:16:58,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:16:58" (3/3) ... [2020-08-21 13:16:58,875 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-08-21 13:16:58,886 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 13:16:58,893 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-21 13:16:58,908 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-21 13:16:58,933 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 13:16:58,933 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 13:16:58,933 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 13:16:58,934 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 13:16:58,934 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 13:16:58,934 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 13:16:58,934 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 13:16:58,934 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 13:16:58,951 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-08-21 13:16:58,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 13:16:58,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:16:58,958 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:16:58,959 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:16:58,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:16:58,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-08-21 13:16:58,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:16:58,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [362487597] [2020-08-21 13:16:58,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:16:59,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:16:59,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:16:59,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:16:59,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 13:16:59,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:16:59,236 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:16:59,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [362487597] [2020-08-21 13:16:59,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:16:59,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-21 13:16:59,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93569734] [2020-08-21 13:16:59,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 13:16:59,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:16:59,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 13:16:59,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 13:16:59,264 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-08-21 13:16:59,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:16:59,402 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-21 13:16:59,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 13:16:59,404 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-08-21 13:16:59,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:16:59,412 INFO L225 Difference]: With dead ends: 34 [2020-08-21 13:16:59,413 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 13:16:59,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-21 13:16:59,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 13:16:59,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 13:16:59,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 13:16:59,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 13:16:59,454 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-08-21 13:16:59,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:16:59,454 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 13:16:59,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 13:16:59,455 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 13:16:59,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 13:16:59,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:16:59,456 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:16:59,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 13:16:59,456 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:16:59,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:16:59,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-08-21 13:16:59,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:16:59,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1232365162] [2020-08-21 13:16:59,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:16:59,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 13:16:59,475 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 13:16:59,478 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 13:16:59,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 13:16:59,497 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 01:16:59 BoogieIcfgContainer [2020-08-21 13:16:59,497 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 13:16:59,500 INFO L168 Benchmark]: Toolchain (without parser) took 1257.76 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 103.1 MB in the beginning and 136.3 MB in the end (delta: -33.1 MB). Peak memory consumption was 23.0 MB. Max. memory is 7.1 GB. [2020-08-21 13:16:59,501 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 147.3 MB. Free memory was 121.8 MB in the beginning and 121.4 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. [2020-08-21 13:16:59,502 INFO L168 Benchmark]: CACSL2BoogieTranslator took 252.12 ms. Allocated memory is still 147.3 MB. Free memory was 103.1 MB in the beginning and 94.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-21 13:16:59,504 INFO L168 Benchmark]: Boogie Preprocessor took 124.65 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 94.0 MB in the beginning and 182.3 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-21 13:16:59,505 INFO L168 Benchmark]: RCFGBuilder took 245.45 ms. Allocated memory is still 203.4 MB. Free memory was 182.3 MB in the beginning and 170.7 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2020-08-21 13:16:59,506 INFO L168 Benchmark]: TraceAbstraction took 630.49 ms. Allocated memory is still 203.4 MB. Free memory was 169.8 MB in the beginning and 136.3 MB in the end (delta: 33.5 MB). Peak memory consumption was 33.5 MB. Max. memory is 7.1 GB. [2020-08-21 13:16:59,510 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 147.3 MB. Free memory was 121.8 MB in the beginning and 121.4 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 252.12 ms. Allocated memory is still 147.3 MB. Free memory was 103.1 MB in the beginning and 94.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 124.65 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 94.0 MB in the beginning and 182.3 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 245.45 ms. Allocated memory is still 203.4 MB. Free memory was 182.3 MB in the beginning and 170.7 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 630.49 ms. Allocated memory is still 203.4 MB. Free memory was 169.8 MB in the beginning and 136.3 MB in the end (delta: 33.5 MB). Peak memory consumption was 33.5 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: 0.5s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 3 SDslu, 48 SDs, 0 SdLazy, 28 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s 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...