/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 -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 0.1.25-5644d1e-m [2020-08-18 16:14:37,947 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 16:14:37,951 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 16:14:37,994 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 16:14:37,995 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:14:37,996 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:14:37,997 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:14:37,999 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:14:38,001 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:14:38,001 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:14:38,002 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:14:38,004 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:14:38,004 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:14:38,005 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:14:38,006 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:14:38,007 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:14:38,008 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:14:38,009 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:14:38,011 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:14:38,013 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:14:38,014 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:14:38,015 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:14:38,016 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:14:38,017 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:14:38,020 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 16:14:38,023 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 16:14:38,024 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 16:14:38,025 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 16:14:38,026 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 16:14:38,026 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 16:14:38,027 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 16:14:38,027 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 16:14:38,028 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 16:14:38,028 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:14:38,029 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:14:38,030 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:14:38,030 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 [2020-08-18 16:14:38,053 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:14:38,054 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:14:38,055 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:14:38,055 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:14:38,055 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:14:38,056 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:14:38,056 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:14:38,056 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:14:38,056 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:14:38,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:14:38,057 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:14:38,057 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:14:38,057 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:14:38,057 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:14:38,057 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:14:38,057 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:14:38,058 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:14:38,058 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:14:38,058 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:14:38,058 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:14:38,058 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:14:38,059 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:14:38,059 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:14:38,059 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:14:38,059 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:14:38,060 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:14:38,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:14:38,060 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:14:38,060 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:14:38,060 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 [2020-08-18 16:14:38,382 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:14:38,395 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:14:38,398 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:14:38,400 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:14:38,400 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:14:38,401 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-08-18 16:14:38,462 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5dfc8e4cb/b56b80ea9c73401ca7a04c2c6315223a/FLAG4aeb34e9d [2020-08-18 16:14:38,889 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:14:38,890 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-08-18 16:14:38,896 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5dfc8e4cb/b56b80ea9c73401ca7a04c2c6315223a/FLAG4aeb34e9d [2020-08-18 16:14:39,251 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5dfc8e4cb/b56b80ea9c73401ca7a04c2c6315223a [2020-08-18 16:14:39,261 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:14:39,263 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:14:39,265 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:14:39,265 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:14:39,269 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:14:39,270 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,274 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48b302c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39, skipping insertion in model container [2020-08-18 16:14:39,274 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,282 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:14:39,298 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:14:39,467 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:14:39,472 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:14:39,487 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:14:39,502 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:14:39,503 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39 WrapperNode [2020-08-18 16:14:39,503 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:14:39,504 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:14:39,504 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:14:39,504 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:14:39,518 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,519 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,616 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,616 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,620 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,624 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,625 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (1/1) ... [2020-08-18 16:14:39,626 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:14:39,626 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:14:39,627 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:14:39,627 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:14:39,627 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (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 [2020-08-18 16:14:39,693 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:14:39,693 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:14:39,693 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-08-18 16:14:39,693 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-08-18 16:14:39,693 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:14:39,694 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:14:39,694 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-08-18 16:14:39,694 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-08-18 16:14:39,694 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:14:39,694 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:14:39,694 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:14:39,861 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:14:39,861 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 16:14:39,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:14:39 BoogieIcfgContainer [2020-08-18 16:14:39,864 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:14:39,866 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:14:39,866 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:14:39,869 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:14:39,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:14:39" (1/3) ... [2020-08-18 16:14:39,870 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ced65ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:14:39, skipping insertion in model container [2020-08-18 16:14:39,870 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:14:39" (2/3) ... [2020-08-18 16:14:39,870 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ced65ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:14:39, skipping insertion in model container [2020-08-18 16:14:39,871 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:14:39" (3/3) ... [2020-08-18 16:14:39,872 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-08-18 16:14:39,883 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:14:39,890 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-18 16:14:39,904 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-18 16:14:39,928 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:14:39,929 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:14:39,929 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:14:39,929 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:14:39,929 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:14:39,929 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:14:39,930 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:14:39,930 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:14:39,949 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-08-18 16:14:39,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 16:14:39,955 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:14:39,957 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:14:39,957 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:14:39,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:14:39,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-08-18 16:14:39,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:14:39,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620728698] [2020-08-18 16:14:39,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:14:40,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:14:40,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:14:40,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:14:40,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 16:14:40,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:14:40,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:14:40,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620728698] [2020-08-18 16:14:40,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:14:40,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-18 16:14:40,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900602398] [2020-08-18 16:14:40,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:14:40,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:14:40,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:14:40,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:14:40,318 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-08-18 16:14:40,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:14:40,438 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 16:14:40,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:14:40,440 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-08-18 16:14:40,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:14:40,451 INFO L225 Difference]: With dead ends: 34 [2020-08-18 16:14:40,451 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 16:14:40,455 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 [2020-08-18 16:14:40,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 16:14:40,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 16:14:40,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 16:14:40,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 16:14:40,495 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-08-18 16:14:40,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:14:40,495 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 16:14:40,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:14:40,496 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 16:14:40,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 16:14:40,497 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:14:40,497 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:14:40,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:14:40,498 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:14:40,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:14:40,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-08-18 16:14:40,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:14:40,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020362674] [2020-08-18 16:14:40,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:14:40,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 16:14:40,514 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 16:14:40,514 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 16:14:40,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:14:40,534 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 04:14:40 BoogieIcfgContainer [2020-08-18 16:14:40,534 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 16:14:40,537 INFO L168 Benchmark]: Toolchain (without parser) took 1273.53 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 100.8 MB in the beginning and 134.6 MB in the end (delta: -33.8 MB). Peak memory consumption was 22.8 MB. Max. memory is 7.1 GB. [2020-08-18 16:14:40,538 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 145.2 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 16:14:40,539 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.58 ms. Allocated memory is still 145.2 MB. Free memory was 100.6 MB in the beginning and 91.6 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-08-18 16:14:40,540 INFO L168 Benchmark]: Boogie Preprocessor took 122.16 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 91.6 MB in the beginning and 180.9 MB in the end (delta: -89.3 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-08-18 16:14:40,541 INFO L168 Benchmark]: RCFGBuilder took 238.04 ms. Allocated memory is still 201.9 MB. Free memory was 180.9 MB in the beginning and 168.3 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-08-18 16:14:40,542 INFO L168 Benchmark]: TraceAbstraction took 668.40 ms. Allocated memory is still 201.9 MB. Free memory was 167.7 MB in the beginning and 134.6 MB in the end (delta: 33.1 MB). Peak memory consumption was 33.1 MB. Max. memory is 7.1 GB. [2020-08-18 16:14:40,546 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 145.2 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 238.58 ms. Allocated memory is still 145.2 MB. Free memory was 100.6 MB in the beginning and 91.6 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 122.16 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 91.6 MB in the beginning and 180.9 MB in the end (delta: -89.3 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 238.04 ms. Allocated memory is still 201.9 MB. Free memory was 180.9 MB in the beginning and 168.3 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 668.40 ms. Allocated memory is still 201.9 MB. Free memory was 167.7 MB in the beginning and 134.6 MB in the end (delta: 33.1 MB). Peak memory consumption was 33.1 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, 0.2s InterpolantComputationTime, 29 NumberOfCodeBlocks, 29 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 12 ConstructedInterpolants, 0 QuantifiedInterpolants, 288 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...