/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-24 17:02:18,905 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-24 17:02:18,910 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-24 17:02:18,954 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-24 17:02:18,955 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-24 17:02:18,963 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-24 17:02:18,966 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-24 17:02:18,969 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-24 17:02:18,972 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-24 17:02:18,976 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-24 17:02:18,977 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-24 17:02:18,978 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-24 17:02:18,978 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-24 17:02:18,982 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-24 17:02:18,985 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-24 17:02:18,986 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-24 17:02:18,988 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-24 17:02:18,989 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-24 17:02:18,992 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-24 17:02:19,002 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-24 17:02:19,005 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-24 17:02:19,006 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-24 17:02:19,007 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-24 17:02:19,008 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-24 17:02:19,020 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-24 17:02:19,026 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-24 17:02:19,026 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-24 17:02:19,027 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-24 17:02:19,031 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-24 17:02:19,032 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-09-24 17:02:19,038 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-24 17:02:19,039 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-24 17:02:19,039 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-24 17:02:19,040 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-24 17:02:19,071 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-24 17:02:19,071 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-24 17:02:19,073 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-24 17:02:19,073 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-24 17:02:19,073 INFO L138 SettingsManager]: * Use SBE=true [2020-09-24 17:02:19,073 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-24 17:02:19,074 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-24 17:02:19,074 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-24 17:02:19,074 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-24 17:02:19,074 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-24 17:02:19,074 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-24 17:02:19,075 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-24 17:02:19,075 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-24 17:02:19,075 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-24 17:02:19,075 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-24 17:02:19,076 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-24 17:02:19,076 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-24 17:02:19,076 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-24 17:02:19,076 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-24 17:02:19,076 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-24 17:02:19,077 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-24 17:02:19,077 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-24 17:02:19,077 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-24 17:02:19,077 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-24 17:02:19,077 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-24 17:02:19,078 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-24 17:02:19,078 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-24 17:02:19,078 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-24 17:02:19,078 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-24 17:02:19,078 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true; [2020-09-24 17:02:19,566 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-24 17:02:19,583 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-24 17:02:19,587 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-24 17:02:19,589 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-24 17:02:19,590 INFO L275 PluginConnector]: CDTParser initialized [2020-09-24 17:02:19,591 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c [2020-09-24 17:02:19,669 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e36320c8b/589427aa3db14a08948bec2744685345/FLAGe90ce6408 [2020-09-24 17:02:20,169 INFO L306 CDTParser]: Found 1 translation units. [2020-09-24 17:02:20,170 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec-1.c [2020-09-24 17:02:20,178 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e36320c8b/589427aa3db14a08948bec2744685345/FLAGe90ce6408 [2020-09-24 17:02:20,499 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e36320c8b/589427aa3db14a08948bec2744685345 [2020-09-24 17:02:20,514 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-24 17:02:20,520 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-24 17:02:20,522 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-24 17:02:20,522 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-24 17:02:20,526 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-24 17:02:20,528 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,532 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@651f0a85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20, skipping insertion in model container [2020-09-24 17:02:20,532 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,542 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-24 17:02:20,566 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-24 17:02:20,794 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 17:02:20,800 INFO L203 MainTranslator]: Completed pre-run [2020-09-24 17:02:20,820 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 17:02:20,839 INFO L208 MainTranslator]: Completed translation [2020-09-24 17:02:20,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20 WrapperNode [2020-09-24 17:02:20,840 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-24 17:02:20,840 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-24 17:02:20,841 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-24 17:02:20,841 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-24 17:02:20,856 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,856 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,862 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,862 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,865 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,867 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,868 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (1/1) ... [2020-09-24 17:02:20,870 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-24 17:02:20,870 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-24 17:02:20,871 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-24 17:02:20,871 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-24 17:02:20,872 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-24 17:02:21,047 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-24 17:02:21,047 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-24 17:02:21,047 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-09-24 17:02:21,047 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-24 17:02:21,048 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-24 17:02:21,048 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-09-24 17:02:21,048 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-24 17:02:21,048 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-24 17:02:21,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-24 17:02:21,213 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-24 17:02:21,214 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-24 17:02:21,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 05:02:21 BoogieIcfgContainer [2020-09-24 17:02:21,218 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-24 17:02:21,219 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-24 17:02:21,219 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-24 17:02:21,223 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-24 17:02:21,223 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 05:02:20" (1/3) ... [2020-09-24 17:02:21,224 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9105eb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 05:02:21, skipping insertion in model container [2020-09-24 17:02:21,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:02:20" (2/3) ... [2020-09-24 17:02:21,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9105eb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 05:02:21, skipping insertion in model container [2020-09-24 17:02:21,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 05:02:21" (3/3) ... [2020-09-24 17:02:21,227 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec-1.c [2020-09-24 17:02:21,236 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-24 17:02:21,246 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-24 17:02:21,268 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-24 17:02:21,297 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-24 17:02:21,297 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-24 17:02:21,297 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-24 17:02:21,298 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-24 17:02:21,298 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-24 17:02:21,298 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-24 17:02:21,298 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-24 17:02:21,298 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-24 17:02:21,318 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-09-24 17:02:21,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-24 17:02:21,324 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 17:02:21,325 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 17:02:21,325 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 17:02:21,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 17:02:21,332 INFO L82 PathProgramCache]: Analyzing trace with hash -611063963, now seen corresponding path program 1 times [2020-09-24 17:02:21,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 17:02:21,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798632405] [2020-09-24 17:02:21,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 17:02:21,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 17:02:21,481 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 17:02:21,573 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 17:02:21,574 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-09-24 17:02:21,574 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 17:02:21,574 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 111 [2020-09-24 17:02:21,576 FATAL L256 erpolLogProxyWrapper]: Heuristic: RANDOM [2020-09-24 17:02:21,576 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-09-24 17:02:21,576 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-09-24 17:02:21,576 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-09-24 17:02:21,577 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-09-24 17:02:21,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 17:02:21,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 17:02:21,675 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 17:02:21,677 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 17:02:21,677 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 17:02:21,677 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 17:02:21,678 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-09-24 17:02:21,678 FATAL L256 erpolLogProxyWrapper]: Heuristic: RANDOM [2020-09-24 17:02:21,678 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 17:02:21,678 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 17:02:21,679 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 17:02:21,679 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 17:02:21,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-24 17:02:21,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 17:02:21,692 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 17:02:21,704 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 17:02:21,705 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 17:02:21,705 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 17:02:21,705 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 15 [2020-09-24 17:02:21,706 FATAL L256 erpolLogProxyWrapper]: Heuristic: RANDOM [2020-09-24 17:02:21,706 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-24 17:02:21,706 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-09-24 17:02:21,706 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-24 17:02:21,707 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 17:02:21,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 17:02:21,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798632405] [2020-09-24 17:02:21,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 17:02:21,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-24 17:02:21,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494279120] [2020-09-24 17:02:21,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-24 17:02:21,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 17:02:21,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-24 17:02:21,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-24 17:02:21,832 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 8 states. [2020-09-24 17:02:22,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 17:02:22,064 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2020-09-24 17:02:22,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-24 17:02:22,067 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-09-24 17:02:22,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 17:02:22,079 INFO L225 Difference]: With dead ends: 29 [2020-09-24 17:02:22,080 INFO L226 Difference]: Without dead ends: 21 [2020-09-24 17:02:22,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2020-09-24 17:02:22,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-24 17:02:22,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-09-24 17:02:22,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-24 17:02:22,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-09-24 17:02:22,130 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 16 [2020-09-24 17:02:22,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 17:02:22,131 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-09-24 17:02:22,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-24 17:02:22,132 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-09-24 17:02:22,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-24 17:02:22,133 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 17:02:22,133 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 17:02:22,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-24 17:02:22,134 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 17:02:22,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 17:02:22,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1633986229, now seen corresponding path program 2 times [2020-09-24 17:02:22,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 17:02:22,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340795842] [2020-09-24 17:02:22,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 17:02:22,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-24 17:02:22,151 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-24 17:02:22,151 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-24 17:02:22,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-24 17:02:22,178 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.09 05:02:22 BoogieIcfgContainer [2020-09-24 17:02:22,178 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-24 17:02:22,182 INFO L168 Benchmark]: Toolchain (without parser) took 1664.86 ms. Allocated memory was 146.8 MB in the beginning and 201.9 MB in the end (delta: 55.1 MB). Free memory was 103.3 MB in the beginning and 120.1 MB in the end (delta: -16.8 MB). Peak memory consumption was 38.2 MB. Max. memory is 7.1 GB. [2020-09-24 17:02:22,183 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 146.8 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-24 17:02:22,185 INFO L168 Benchmark]: CACSL2BoogieTranslator took 318.51 ms. Allocated memory is still 146.8 MB. Free memory was 102.7 MB in the beginning and 94.0 MB in the end (delta: 8.7 MB). Peak memory consumption was 8.7 MB. Max. memory is 7.1 GB. [2020-09-24 17:02:22,186 INFO L168 Benchmark]: Boogie Preprocessor took 29.54 ms. Allocated memory is still 146.8 MB. Free memory was 94.0 MB in the beginning and 92.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-09-24 17:02:22,187 INFO L168 Benchmark]: RCFGBuilder took 347.64 ms. Allocated memory was 146.8 MB in the beginning and 201.9 MB in the end (delta: 55.1 MB). Free memory was 92.6 MB in the beginning and 170.6 MB in the end (delta: -78.0 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-09-24 17:02:22,190 INFO L168 Benchmark]: TraceAbstraction took 959.48 ms. Allocated memory is still 201.9 MB. Free memory was 169.9 MB in the beginning and 120.1 MB in the end (delta: 49.8 MB). Peak memory consumption was 49.8 MB. Max. memory is 7.1 GB. [2020-09-24 17:02:22,199 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 146.8 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 318.51 ms. Allocated memory is still 146.8 MB. Free memory was 102.7 MB in the beginning and 94.0 MB in the end (delta: 8.7 MB). Peak memory consumption was 8.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.54 ms. Allocated memory is still 146.8 MB. Free memory was 94.0 MB in the beginning and 92.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 347.64 ms. Allocated memory was 146.8 MB in the beginning and 201.9 MB in the end (delta: 55.1 MB). Free memory was 92.6 MB in the beginning and 170.6 MB in the end (delta: -78.0 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 959.48 ms. Allocated memory is still 201.9 MB. Free memory was 169.9 MB in the beginning and 120.1 MB in the end (delta: 49.8 MB). Peak memory consumption was 49.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] CALL f(4) [L4] COND FALSE !(n<3) [L5] n-- [L6] CALL f(n) [L4] COND FALSE !(n<3) [L5] n-- [L6] CALL f(n) [L4] COND TRUE n<3 [L6] RET f(n) [L7] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.8s, OverallIterations: 2, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 9 SDtfs, 13 SDslu, 43 SDs, 0 SdLazy, 43 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=1, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 38 NumberOfCodeBlocks, 38 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 15 ConstructedInterpolants, 0 QuantifiedInterpolants, 495 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 0 PerfectInterpolantSequences, 0/2 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...