/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 01:57:25,590 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-19 01:57:25,656 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 01:57:25,661 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 01:57:25,664 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 01:57:25,665 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 01:57:25,667 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 01:57:25,669 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 01:57:25,670 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 01:57:25,679 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 01:57:25,681 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 01:57:25,682 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 01:57:25,683 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 01:57:25,684 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 01:57:25,695 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 01:57:25,705 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 01:57:25,706 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 01:57:25,708 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 01:57:25,709 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 [2020-08-19 01:57:25,748 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 01:57:25,749 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 01:57:25,751 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 01:57:25,751 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 01:57:25,751 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 01:57:25,752 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 01:57:25,752 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 01:57:25,752 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 01:57:25,752 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 01:57:25,753 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 01:57:25,754 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 01:57:25,754 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 01:57:25,754 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 01:57:25,754 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 01:57:25,755 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 01:57:25,755 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 01:57:25,755 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 01:57:25,755 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 01:57:25,755 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 01:57:25,756 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 01:57:25,756 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 01:57:25,756 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:57:25,756 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 01:57:25,756 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 01:57:25,757 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 01:57:25,757 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 01:57:25,757 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 01:57:25,757 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 01:57:25,757 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 01:57:25,757 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=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; [2020-08-19 01:57:26,049 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 01:57:26,062 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 01:57:26,066 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 01:57:26,067 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 01:57:26,068 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 01:57:26,068 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o3.c [2020-08-19 01:57:26,131 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f61fd3e05/061606927a3e4f91b77b684da325f7a3/FLAGf609a9f8c [2020-08-19 01:57:26,581 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 01:57:26,582 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_o3.c [2020-08-19 01:57:26,588 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f61fd3e05/061606927a3e4f91b77b684da325f7a3/FLAGf609a9f8c [2020-08-19 01:57:26,975 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f61fd3e05/061606927a3e4f91b77b684da325f7a3 [2020-08-19 01:57:26,986 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 01:57:26,987 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 01:57:26,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 01:57:26,990 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 01:57:26,994 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 01:57:26,996 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:57:26" (1/1) ... [2020-08-19 01:57:26,999 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6faa959a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:26, skipping insertion in model container [2020-08-19 01:57:26,999 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:57:26" (1/1) ... [2020-08-19 01:57:27,008 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 01:57:27,027 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 01:57:27,186 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:57:27,190 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 01:57:27,206 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:57:27,220 INFO L208 MainTranslator]: Completed translation [2020-08-19 01:57:27,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27 WrapperNode [2020-08-19 01:57:27,221 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 01:57:27,221 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 01:57:27,222 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 01:57:27,222 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 01:57:27,232 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (1/1) ... [2020-08-19 01:57:27,232 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (1/1) ... [2020-08-19 01:57:27,237 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (1/1) ... [2020-08-19 01:57:27,237 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (1/1) ... [2020-08-19 01:57:27,241 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (1/1) ... [2020-08-19 01:57:27,243 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (1/1) ... [2020-08-19 01:57:27,243 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (1/1) ... [2020-08-19 01:57:27,245 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 01:57:27,245 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 01:57:27,245 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 01:57:27,246 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 01:57:27,246 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (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 [2020-08-19 01:57:27,408 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 01:57:27,409 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 01:57:27,409 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-19 01:57:27,409 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 01:57:27,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-19 01:57:27,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 01:57:27,410 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-19 01:57:27,411 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 01:57:27,411 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 01:57:27,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 01:57:27,589 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 01:57:27,590 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 01:57:27,594 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:57:27 BoogieIcfgContainer [2020-08-19 01:57:27,594 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 01:57:27,596 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 01:57:27,596 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 01:57:27,599 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 01:57:27,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 01:57:26" (1/3) ... [2020-08-19 01:57:27,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43d3a052 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:57:27, skipping insertion in model container [2020-08-19 01:57:27,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:57:27" (2/3) ... [2020-08-19 01:57:27,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43d3a052 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:57:27, skipping insertion in model container [2020-08-19 01:57:27,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:57:27" (3/3) ... [2020-08-19 01:57:27,603 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o3.c [2020-08-19 01:57:27,614 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 01:57:27,622 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 01:57:27,637 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 01:57:27,658 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 01:57:27,659 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 01:57:27,659 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 01:57:27,659 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 01:57:27,659 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 01:57:27,659 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 01:57:27,659 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 01:57:27,660 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 01:57:27,676 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-19 01:57:27,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 01:57:27,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:57:27,682 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:57:27,683 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:57:27,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:57:27,688 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-19 01:57:27,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:57:27,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1077922968] [2020-08-19 01:57:27,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:57:27,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,003 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2020-08-19 01:57:28,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:57:28,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 01:57:28,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,192 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:57:28,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1077922968] [2020-08-19 01:57:28,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:57:28,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 01:57:28,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413862443] [2020-08-19 01:57:28,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 01:57:28,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:57:28,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 01:57:28,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:57:28,219 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-19 01:57:28,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:57:28,261 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-08-19 01:57:28,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 01:57:28,263 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 01:57:28,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:57:28,273 INFO L225 Difference]: With dead ends: 32 [2020-08-19 01:57:28,274 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 01:57:28,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:57:28,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 01:57:28,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 01:57:28,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 01:57:28,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-19 01:57:28,321 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-19 01:57:28,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:57:28,325 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-19 01:57:28,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 01:57:28,325 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-19 01:57:28,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 01:57:28,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:57:28,327 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:57:28,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 01:57:28,328 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:57:28,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:57:28,328 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-19 01:57:28,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:57:28,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330208343] [2020-08-19 01:57:28,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:57:28,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:57:28,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 01:57:28,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 01:57:28,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,509 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-19 01:57:28,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330208343] [2020-08-19 01:57:28,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:57:28,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 01:57:28,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225977636] [2020-08-19 01:57:28,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 01:57:28,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:57:28,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 01:57:28,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:57:28,514 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2020-08-19 01:57:28,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:57:28,541 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-19 01:57:28,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 01:57:28,541 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-19 01:57:28,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:57:28,543 INFO L225 Difference]: With dead ends: 25 [2020-08-19 01:57:28,543 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 01:57:28,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:57:28,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 01:57:28,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 01:57:28,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 01:57:28,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-19 01:57:28,551 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-19 01:57:28,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:57:28,551 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-19 01:57:28,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 01:57:28,552 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-19 01:57:28,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 01:57:28,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:57:28,553 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:57:28,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 01:57:28,554 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:57:28,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:57:28,554 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-19 01:57:28,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:57:28,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348199513] [2020-08-19 01:57:28,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:57:28,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:57:28,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 01:57:28,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 01:57:28,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 01:57:28,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:57:28,783 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-19 01:57:28,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348199513] [2020-08-19 01:57:28,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:57:28,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 01:57:28,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672533690] [2020-08-19 01:57:28,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 01:57:28,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:57:28,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 01:57:28,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:57:28,786 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2020-08-19 01:57:28,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:57:28,830 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-19 01:57:28,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 01:57:28,831 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-19 01:57:28,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:57:28,832 INFO L225 Difference]: With dead ends: 28 [2020-08-19 01:57:28,833 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 01:57:28,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:57:28,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 01:57:28,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 01:57:28,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 01:57:28,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-19 01:57:28,840 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-19 01:57:28,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:57:28,841 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-19 01:57:28,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 01:57:28,841 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-19 01:57:28,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 01:57:28,843 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:57:28,843 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:57:28,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 01:57:28,843 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:57:28,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:57:28,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-19 01:57:28,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:57:28,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241152367] [2020-08-19 01:57:28,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:57:28,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-19 01:57:28,864 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-19 01:57:28,865 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-19 01:57:28,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 01:57:28,888 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 01:57:28 BoogieIcfgContainer [2020-08-19 01:57:28,889 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 01:57:28,891 INFO L168 Benchmark]: Toolchain (without parser) took 1903.42 ms. Allocated memory was 140.5 MB in the beginning and 205.0 MB in the end (delta: 64.5 MB). Free memory was 103.4 MB in the beginning and 100.4 MB in the end (delta: 3.0 MB). Peak memory consumption was 67.5 MB. Max. memory is 7.1 GB. [2020-08-19 01:57:28,892 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-19 01:57:28,893 INFO L168 Benchmark]: CACSL2BoogieTranslator took 231.13 ms. Allocated memory is still 140.5 MB. Free memory was 103.2 MB in the beginning and 94.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-19 01:57:28,894 INFO L168 Benchmark]: Boogie Preprocessor took 23.40 ms. Allocated memory is still 140.5 MB. Free memory was 94.0 MB in the beginning and 92.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-19 01:57:28,895 INFO L168 Benchmark]: RCFGBuilder took 349.14 ms. Allocated memory was 140.5 MB in the beginning and 205.0 MB in the end (delta: 64.5 MB). Free memory was 92.6 MB in the beginning and 172.9 MB in the end (delta: -80.3 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-08-19 01:57:28,896 INFO L168 Benchmark]: TraceAbstraction took 1293.15 ms. Allocated memory is still 205.0 MB. Free memory was 172.2 MB in the beginning and 100.4 MB in the end (delta: 71.8 MB). Peak memory consumption was 71.8 MB. Max. memory is 7.1 GB. [2020-08-19 01:57:28,900 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 231.13 ms. Allocated memory is still 140.5 MB. Free memory was 103.2 MB in the beginning and 94.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.40 ms. Allocated memory is still 140.5 MB. Free memory was 94.0 MB in the beginning and 92.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 349.14 ms. Allocated memory was 140.5 MB in the beginning and 205.0 MB in the end (delta: 64.5 MB). Free memory was 92.6 MB in the beginning and 172.9 MB in the end (delta: -80.3 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1293.15 ms. Allocated memory is still 205.0 MB. Free memory was 172.2 MB in the beginning and 100.4 MB in the end (delta: 71.8 MB). Peak memory consumption was 71.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] unsigned int result = id(input); [L12] COND TRUE result == 3 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.2s, OverallIterations: 4, TraceHistogramMax: 4, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 55 SDtfs, 2 SDslu, 252 SDs, 0 SdLazy, 54 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=3, 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 88 NumberOfCodeBlocks, 88 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 54 ConstructedInterpolants, 0 QuantifiedInterpolants, 3744 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 9/18 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...