/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 true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --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 0.1.25-177f698 [2020-08-21 17:18:21,057 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:18:21,060 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:18:21,101 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:18:21,101 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:18:21,110 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:18:21,112 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:18:21,117 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:18:21,120 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:18:21,121 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:18:21,122 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:18:21,123 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:18:21,123 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:18:21,124 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:18:21,125 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:18:21,126 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:18:21,127 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:18:21,127 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:18:21,129 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:18:21,130 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:18:21,132 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:18:21,133 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:18:21,134 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:18:21,135 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:18:21,137 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 17:18:21,144 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:18:21,145 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:18:21,146 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:18:21,147 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 17:18:21,168 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:18:21,168 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:18:21,169 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:18:21,170 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:18:21,170 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:18:21,170 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:18:21,170 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:18:21,171 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:18:21,171 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:18:21,171 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:18:21,171 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:18:21,171 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:18:21,172 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:18:21,172 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:18:21,172 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:18:21,172 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:18:21,172 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:18:21,173 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:18:21,173 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:18:21,173 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:18:21,173 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:18:21,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:18:21,174 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:18:21,174 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:18:21,174 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:18:21,174 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:18:21,174 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:18:21,175 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:18:21,175 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:18:21,175 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 -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:18:21,496 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:18:21,513 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:18:21,517 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:18:21,519 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:18:21,520 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:18:21,521 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-08-21 17:18:21,580 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/07bb05d25/25bc80e260ec422eaa088a381ec593eb/FLAG7478be33e [2020-08-21 17:18:22,032 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:18:22,033 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-08-21 17:18:22,040 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/07bb05d25/25bc80e260ec422eaa088a381ec593eb/FLAG7478be33e [2020-08-21 17:18:22,385 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/07bb05d25/25bc80e260ec422eaa088a381ec593eb [2020-08-21 17:18:22,397 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:18:22,399 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:18:22,400 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:18:22,401 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:18:22,404 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:18:22,405 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,409 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1cd0480f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22, skipping insertion in model container [2020-08-21 17:18:22,409 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,417 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:18:22,437 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:18:22,661 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:18:22,667 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:18:22,685 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:18:22,703 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:18:22,704 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22 WrapperNode [2020-08-21 17:18:22,704 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:18:22,705 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:18:22,705 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:18:22,706 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:18:22,718 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,718 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,800 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,800 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,804 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,806 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,807 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (1/1) ... [2020-08-21 17:18:22,809 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:18:22,809 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:18:22,810 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:18:22,810 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:18:22,811 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (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 17:18:22,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:18:22,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:18:22,876 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-08-21 17:18:22,876 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-08-21 17:18:22,877 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:18:22,877 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:18:22,877 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-08-21 17:18:22,877 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-08-21 17:18:22,877 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:18:22,877 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:18:22,878 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:18:23,048 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:18:23,048 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 17:18:23,052 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:18:23 BoogieIcfgContainer [2020-08-21 17:18:23,053 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:18:23,054 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:18:23,054 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:18:23,057 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:18:23,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:18:22" (1/3) ... [2020-08-21 17:18:23,058 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aac61c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:18:23, skipping insertion in model container [2020-08-21 17:18:23,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:22" (2/3) ... [2020-08-21 17:18:23,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aac61c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:18:23, skipping insertion in model container [2020-08-21 17:18:23,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:18:23" (3/3) ... [2020-08-21 17:18:23,061 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-08-21 17:18:23,071 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:18:23,078 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-21 17:18:23,089 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-21 17:18:23,114 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:18:23,114 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:18:23,115 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:18:23,115 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:18:23,115 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:18:23,115 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:18:23,115 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:18:23,115 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:18:23,134 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-08-21 17:18:23,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 17:18:23,141 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:23,142 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:23,143 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:23,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:23,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-08-21 17:18:23,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:23,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194595394] [2020-08-21 17:18:23,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:23,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:23,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:23,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:23,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 17:18:23,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:23,426 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 17:18:23,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194595394] [2020-08-21 17:18:23,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:18:23,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-21 17:18:23,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198832291] [2020-08-21 17:18:23,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:18:23,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:23,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:18:23,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:18:23,457 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-08-21 17:18:23,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:23,604 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-21 17:18:23,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:18:23,606 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-08-21 17:18:23,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:23,616 INFO L225 Difference]: With dead ends: 34 [2020-08-21 17:18:23,616 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 17:18:23,620 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 17:18:23,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 17:18:23,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 17:18:23,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 17:18:23,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 17:18:23,662 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-08-21 17:18:23,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:23,662 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 17:18:23,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:18:23,663 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 17:18:23,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 17:18:23,664 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:23,664 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:23,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:18:23,665 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:23,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:23,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-08-21 17:18:23,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:23,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033722458] [2020-08-21 17:18:23,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:23,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 17:18:23,681 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 17:18:23,682 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 17:18:23,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:18:23,701 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 05:18:23 BoogieIcfgContainer [2020-08-21 17:18:23,701 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 17:18:23,704 INFO L168 Benchmark]: Toolchain (without parser) took 1303.85 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 103.0 MB in the beginning and 135.6 MB in the end (delta: -32.6 MB). Peak memory consumption was 30.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:23,705 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 140.0 MB. Free memory was 121.6 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. [2020-08-21 17:18:23,706 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.58 ms. Allocated memory is still 140.0 MB. Free memory was 102.8 MB in the beginning and 93.8 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:23,707 INFO L168 Benchmark]: Boogie Preprocessor took 103.76 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 93.8 MB in the beginning and 182.0 MB in the end (delta: -88.2 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:23,709 INFO L168 Benchmark]: RCFGBuilder took 243.35 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 169.7 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:23,710 INFO L168 Benchmark]: TraceAbstraction took 647.59 ms. Allocated memory is still 202.9 MB. Free memory was 169.1 MB in the beginning and 135.6 MB in the end (delta: 33.4 MB). Peak memory consumption was 33.4 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:23,714 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 140.0 MB. Free memory was 121.6 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 304.58 ms. Allocated memory is still 140.0 MB. Free memory was 102.8 MB in the beginning and 93.8 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 103.76 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 93.8 MB in the beginning and 182.0 MB in the end (delta: -88.2 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 243.35 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 169.7 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 647.59 ms. Allocated memory is still 202.9 MB. Free memory was 169.1 MB in the beginning and 135.6 MB in the end (delta: 33.4 MB). Peak memory consumption was 33.4 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, 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...