/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 enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c
--------------------------------------------------------------------------------
This is Ultimate 0.1.25-c90d42b
[2020-09-25 03:12:36,063 INFO L177 SettingsManager]: Resetting all preferences to default values...
[2020-09-25 03:12:36,067 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values
[2020-09-25 03:12:36,094 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-09-25 03:12:36,095 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-09-25 03:12:36,096 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-09-25 03:12:36,097 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-09-25 03:12:36,099 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values
[2020-09-25 03:12:36,101 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-09-25 03:12:36,102 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-09-25 03:12:36,103 INFO L181 SettingsManager]: Resetting Sifa preferences to default values
[2020-09-25 03:12:36,104 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-09-25 03:12:36,104 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-09-25 03:12:36,105 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-09-25 03:12:36,106 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-09-25 03:12:36,107 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-09-25 03:12:36,108 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-09-25 03:12:36,109 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-09-25 03:12:36,111 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-09-25 03:12:36,113 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values
[2020-09-25 03:12:36,115 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-09-25 03:12:36,116 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-09-25 03:12:36,118 INFO L181 SettingsManager]: Resetting Referee preferences to default values
[2020-09-25 03:12:36,119 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-09-25 03:12:36,122 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-09-25 03:12:36,122 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-09-25 03:12:36,125 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-09-25 03:12:36,126 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-09-25 03:12:36,127 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-09-25 03:12:36,128 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-09-25 03:12:36,128 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-09-25 03:12:36,129 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-09-25 03:12:36,130 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-09-25 03:12:36,134 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values
[2020-09-25 03:12:36,135 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-09-25 03:12:36,135 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values
[2020-09-25 03:12:36,137 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-09-25 03:12:36,137 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-09-25 03:12:36,137 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values
[2020-09-25 03:12:36,139 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values
[2020-09-25 03:12:36,139 INFO L188 SettingsManager]: Finished resetting all preferences to default values...
[2020-09-25 03:12:36,140 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
[2020-09-25 03:12:36,193 INFO L113 SettingsManager]: Loading preferences was successful
[2020-09-25 03:12:36,194 INFO L115 SettingsManager]: Preferences different from defaults after loading the file:
[2020-09-25 03:12:36,196 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-09-25 03:12:36,196 INFO L138 SettingsManager]: * Create parallel compositions if possible=false
[2020-09-25 03:12:36,197 INFO L138 SettingsManager]: * Use SBE=true
[2020-09-25 03:12:36,197 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-09-25 03:12:36,197 INFO L138 SettingsManager]: * sizeof long=4
[2020-09-25 03:12:36,197 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true
[2020-09-25 03:12:36,198 INFO L138 SettingsManager]: * sizeof POINTER=4
[2020-09-25 03:12:36,198 INFO L138 SettingsManager]: * Check division by zero=IGNORE
[2020-09-25 03:12:36,199 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE
[2020-09-25 03:12:36,199 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-09-25 03:12:36,199 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE
[2020-09-25 03:12:36,200 INFO L138 SettingsManager]: * sizeof long double=12
[2020-09-25 03:12:36,200 INFO L138 SettingsManager]: * Check if freed pointer was valid=false
[2020-09-25 03:12:36,200 INFO L138 SettingsManager]: * Use constant arrays=true
[2020-09-25 03:12:36,201 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE
[2020-09-25 03:12:36,201 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-09-25 03:12:36,201 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements
[2020-09-25 03:12:36,201 INFO L138 SettingsManager]: * To the following directory=./dump/
[2020-09-25 03:12:36,202 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode
[2020-09-25 03:12:36,202 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-25 03:12:36,202 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-09-25 03:12:36,202 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP
[2020-09-25 03:12:36,203 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-09-25 03:12:36,203 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL
[2020-09-25 03:12:36,203 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-09-25 03:12:36,203 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-09-25 03:12:36,204 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE
[2020-09-25 03:12:36,204 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;enumeration-timeout=5000;interpolation-heuristic=WIDEST;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;enumeration-timeout=5000;interpolation-heuristic=WIDEST;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;enumeration-timeout=5000;interpolation-heuristic=WIDEST;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;enumeration-timeout=5000;interpolation-heuristic=WIDEST;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;enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true;
[2020-09-25 03:12:36,699 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp
[2020-09-25 03:12:36,717 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-09-25 03:12:36,722 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-09-25 03:12:36,724 INFO L271 PluginConnector]: Initializing CDTParser...
[2020-09-25 03:12:36,724 INFO L275 PluginConnector]: CDTParser initialized
[2020-09-25 03:12:36,725 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c
[2020-09-25 03:12:36,807 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9117eab59/8f87d788b6d04ec081037e124bf6da2d/FLAG28701d7f8
[2020-09-25 03:12:37,332 INFO L306 CDTParser]: Found 1 translation units.
[2020-09-25 03:12:37,333 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/verifythis/tree_max_incorrect.c
[2020-09-25 03:12:37,342 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9117eab59/8f87d788b6d04ec081037e124bf6da2d/FLAG28701d7f8
[2020-09-25 03:12:37,659 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9117eab59/8f87d788b6d04ec081037e124bf6da2d
[2020-09-25 03:12:37,674 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-09-25 03:12:37,681 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements.
[2020-09-25 03:12:37,682 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-09-25 03:12:37,682 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-09-25 03:12:37,686 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized
[2020-09-25 03:12:37,688 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 03:12:37" (1/1) ...
[2020-09-25 03:12:37,693 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@145c9163 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:37, skipping insertion in model container
[2020-09-25 03:12:37,693 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 03:12:37" (1/1) ...
[2020-09-25 03:12:37,703 INFO L145 MainTranslator]: Starting translation in SV-COMP mode
[2020-09-25 03:12:37,731 INFO L178 MainTranslator]: Built tables and reachable declarations
[2020-09-25 03:12:37,960 INFO L206 PostProcessor]: Analyzing one entry point: main
[2020-09-25 03:12:37,972 INFO L203 MainTranslator]: Completed pre-run
[2020-09-25 03:12:37,994 INFO L206 PostProcessor]: Analyzing one entry point: main
[2020-09-25 03:12:38,016 INFO L208 MainTranslator]: Completed translation
[2020-09-25 03:12:38,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38 WrapperNode
[2020-09-25 03:12:38,017 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-09-25 03:12:38,018 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-09-25 03:12:38,018 INFO L271 PluginConnector]: Initializing Boogie Preprocessor...
[2020-09-25 03:12:38,018 INFO L275 PluginConnector]: Boogie Preprocessor initialized
[2020-09-25 03:12:38,116 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (1/1) ...
[2020-09-25 03:12:38,116 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (1/1) ...
[2020-09-25 03:12:38,130 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (1/1) ...
[2020-09-25 03:12:38,130 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (1/1) ...
[2020-09-25 03:12:38,141 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (1/1) ...
[2020-09-25 03:12:38,144 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (1/1) ...
[2020-09-25 03:12:38,146 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (1/1) ...
[2020-09-25 03:12:38,149 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-09-25 03:12:38,150 INFO L113 PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-09-25 03:12:38,150 INFO L271 PluginConnector]: Initializing RCFGBuilder...
[2020-09-25 03:12:38,150 INFO L275 PluginConnector]: RCFGBuilder initialized
[2020-09-25 03:12:38,151 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (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
[2020-09-25 03:12:38,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-09-25 03:12:38,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-09-25 03:12:38,235 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-09-25 03:12:38,235 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree
[2020-09-25 03:12:38,236 INFO L138 BoogieDeclarations]: Found implementation of procedure max
[2020-09-25 03:12:38,236 INFO L138 BoogieDeclarations]: Found implementation of procedure check
[2020-09-25 03:12:38,236 INFO L138 BoogieDeclarations]: Found implementation of procedure task
[2020-09-25 03:12:38,236 INFO L138 BoogieDeclarations]: Found implementation of procedure main
[2020-09-25 03:12:38,237 INFO L130 BoogieDeclarations]: Found specification of procedure malloc
[2020-09-25 03:12:38,237 INFO L130 BoogieDeclarations]: Found specification of procedure free
[2020-09-25 03:12:38,237 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-09-25 03:12:38,237 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-09-25 03:12:38,237 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-09-25 03:12:38,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-09-25 03:12:38,238 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree
[2020-09-25 03:12:38,238 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2020-09-25 03:12:38,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~int
[2020-09-25 03:12:38,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2020-09-25 03:12:38,239 INFO L130 BoogieDeclarations]: Found specification of procedure max
[2020-09-25 03:12:38,239 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2020-09-25 03:12:38,239 INFO L130 BoogieDeclarations]: Found specification of procedure check
[2020-09-25 03:12:38,239 INFO L130 BoogieDeclarations]: Found specification of procedure read~int
[2020-09-25 03:12:38,239 INFO L130 BoogieDeclarations]: Found specification of procedure task
[2020-09-25 03:12:38,240 INFO L130 BoogieDeclarations]: Found specification of procedure main
[2020-09-25 03:12:38,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-09-25 03:12:38,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-09-25 03:12:38,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-09-25 03:12:38,649 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-09-25 03:12:38,650 INFO L295 CfgBuilder]: Removed 0 assume(true) statements.
[2020-09-25 03:12:38,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 03:12:38 BoogieIcfgContainer
[2020-09-25 03:12:38,656 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-09-25 03:12:38,657 INFO L113 PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-09-25 03:12:38,657 INFO L271 PluginConnector]: Initializing TraceAbstraction...
[2020-09-25 03:12:38,661 INFO L275 PluginConnector]: TraceAbstraction initialized
[2020-09-25 03:12:38,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 03:12:37" (1/3) ...
[2020-09-25 03:12:38,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d94f68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 03:12:38, skipping insertion in model container
[2020-09-25 03:12:38,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 03:12:38" (2/3) ...
[2020-09-25 03:12:38,663 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d94f68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 03:12:38, skipping insertion in model container
[2020-09-25 03:12:38,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 03:12:38" (3/3) ...
[2020-09-25 03:12:38,665 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c
[2020-09-25 03:12:38,681 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-09-25 03:12:38,691 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-09-25 03:12:38,714 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-09-25 03:12:38,746 INFO L375 AbstractCegarLoop]: Interprodecural is true
[2020-09-25 03:12:38,746 INFO L376 AbstractCegarLoop]: Hoare is true
[2020-09-25 03:12:38,746 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-09-25 03:12:38,747 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-09-25 03:12:38,747 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-09-25 03:12:38,747 INFO L380 AbstractCegarLoop]: Difference is false
[2020-09-25 03:12:38,747 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-09-25 03:12:38,747 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-09-25 03:12:38,773 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states.
[2020-09-25 03:12:38,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34
[2020-09-25 03:12:38,782 INFO L414 BasicCegarLoop]: Found error trace
[2020-09-25 03:12:38,784 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-25 03:12:38,784 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-25 03:12:38,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier
[2020-09-25 03:12:38,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1509507830, now seen corresponding path program 1 times
[2020-09-25 03:12:38,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-25 03:12:38,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791852599]
[2020-09-25 03:12:38,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-25 03:12:38,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-25 03:12:39,007 FATAL L256 erpolLogProxyWrapper]: Now shrinking...
[2020-09-25 03:12:39,254 FATAL L256 erpolLogProxyWrapper]: Now shrinking...
[2020-09-25 03:12:39,942 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000
[2020-09-25 03:12:39,942 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50
[2020-09-25 03:12:39,942 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-09-25 03:12:39,943 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 974
[2020-09-25 03:12:39,946 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDEST
[2020-09-25 03:12:39,947 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7
[2020-09-25 03:12:39,947 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 19
[2020-09-25 03:12:39,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24
[2020-09-25 03:12:39,948 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5
[2020-09-25 03:12:40,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-25 03:12:40,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-25 03:12:40,146 FATAL L256 erpolLogProxyWrapper]: Now shrinking...
[2020-09-25 03:12:40,154 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000
[2020-09-25 03:12:40,155 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11
[2020-09-25 03:12:40,155 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-25 03:12:40,156 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9
[2020-09-25 03:12:40,156 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDEST
[2020-09-25 03:12:40,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-25 03:12:40,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-25 03:12:40,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-25 03:12:40,158 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-25 03:12:40,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7
[2020-09-25 03:12:40,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-25 03:12:40,212 FATAL L256 erpolLogProxyWrapper]: Now shrinking...
[2020-09-25 03:12:40,244 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000
[2020-09-25 03:12:40,245 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11
[2020-09-25 03:12:40,245 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-25 03:12:40,245 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 39
[2020-09-25 03:12:40,245 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDEST
[2020-09-25 03:12:40,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3
[2020-09-25 03:12:40,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-25 03:12:40,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6
[2020-09-25 03:12:40,246 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-25 03:12:40,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15
[2020-09-25 03:12:40,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-25 03:12:40,290 FATAL L256 erpolLogProxyWrapper]: Now shrinking...
[2020-09-25 03:12:40,299 FATAL L256 erpolLogProxyWrapper]: Now shrinking...
[2020-09-25 03:12:40,328 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000
[2020-09-25 03:12:40,328 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11
[2020-09-25 03:12:40,328 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-09-25 03:12:40,329 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 40
[2020-09-25 03:12:40,329 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDEST
[2020-09-25 03:12:40,330 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-09-25 03:12:40,330 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-25 03:12:40,330 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8
[2020-09-25 03:12:40,331 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-25 03:12:40,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-25 03:12:40,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791852599]
[2020-09-25 03:12:40,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-25 03:12:40,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12
[2020-09-25 03:12:40,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92908133]
[2020-09-25 03:12:40,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-09-25 03:12:40,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-25 03:12:40,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-09-25 03:12:40,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132
[2020-09-25 03:12:40,453 INFO L87 Difference]: Start difference. First operand 83 states. Second operand 12 states.
[2020-09-25 03:12:41,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-25 03:12:41,731 INFO L93 Difference]: Finished difference Result 168 states and 204 transitions.
[2020-09-25 03:12:41,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states.
[2020-09-25 03:12:41,734 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33
[2020-09-25 03:12:41,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-25 03:12:41,752 INFO L225 Difference]: With dead ends: 168
[2020-09-25 03:12:41,753 INFO L226 Difference]: Without dead ends: 76
[2020-09-25 03:12:41,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552
[2020-09-25 03:12:41,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states.
[2020-09-25 03:12:41,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76.
[2020-09-25 03:12:41,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states.
[2020-09-25 03:12:41,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 86 transitions.
[2020-09-25 03:12:41,834 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 86 transitions. Word has length 33
[2020-09-25 03:12:41,835 INFO L84 Accepts]: Finished accepts. word is rejected.
[2020-09-25 03:12:41,835 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 86 transitions.
[2020-09-25 03:12:41,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-09-25 03:12:41,836 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 86 transitions.
[2020-09-25 03:12:41,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78
[2020-09-25 03:12:41,841 INFO L414 BasicCegarLoop]: Found error trace
[2020-09-25 03:12:41,842 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-25 03:12:41,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-09-25 03:12:41,843 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-25 03:12:41,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier
[2020-09-25 03:12:41,843 INFO L82 PathProgramCache]: Analyzing trace with hash 2103557100, now seen corresponding path program 1 times
[2020-09-25 03:12:41,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-25 03:12:41,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255552466]
[2020-09-25 03:12:41,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-25 03:12:41,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-09-25 03:12:41,897 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-09-25 03:12:41,897 INFO L520 BasicCegarLoop]: Counterexample might be feasible
[2020-09-25 03:12:41,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-09-25 03:12:41,933 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 03:12:41 BoogieIcfgContainer
[2020-09-25 03:12:41,933 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-09-25 03:12:41,937 INFO L168 Benchmark]: Toolchain (without parser) took 4258.99 ms. Allocated memory was 147.3 MB in the beginning and 243.3 MB in the end (delta: 95.9 MB). Free memory was 103.8 MB in the beginning and 138.0 MB in the end (delta: -34.2 MB). Peak memory consumption was 61.8 MB. Max. memory is 7.1 GB.
[2020-09-25 03:12:41,938 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 147.3 MB. Free memory was 122.0 MB in the beginning and 121.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-09-25 03:12:41,939 INFO L168 Benchmark]: CACSL2BoogieTranslator took 335.67 ms. Allocated memory is still 147.3 MB. Free memory was 103.2 MB in the beginning and 92.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB.
[2020-09-25 03:12:41,940 INFO L168 Benchmark]: Boogie Preprocessor took 131.45 ms. Allocated memory was 147.3 MB in the beginning and 202.4 MB in the end (delta: 55.1 MB). Free memory was 92.5 MB in the beginning and 180.2 MB in the end (delta: -87.7 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB.
[2020-09-25 03:12:41,941 INFO L168 Benchmark]: RCFGBuilder took 506.26 ms. Allocated memory is still 202.4 MB. Free memory was 179.6 MB in the beginning and 156.7 MB in the end (delta: 22.8 MB). Peak memory consumption was 22.8 MB. Max. memory is 7.1 GB.
[2020-09-25 03:12:41,943 INFO L168 Benchmark]: TraceAbstraction took 3276.05 ms. Allocated memory was 202.4 MB in the beginning and 243.3 MB in the end (delta: 40.9 MB). Free memory was 156.0 MB in the beginning and 138.0 MB in the end (delta: 18.1 MB). Peak memory consumption was 59.0 MB. Max. memory is 7.1 GB.
[2020-09-25 03:12:41,947 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] #######################
--- Results ---
* Results from de.uni_freiburg.informatik.ultimate.core:
- StatisticsResult: Toolchain Benchmarks
Benchmark results are:
* CDTParser took 0.23 ms. Allocated memory is still 147.3 MB. Free memory was 122.0 MB in the beginning and 121.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
* CACSL2BoogieTranslator took 335.67 ms. Allocated memory is still 147.3 MB. Free memory was 103.2 MB in the beginning and 92.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB.
* Boogie Preprocessor took 131.45 ms. Allocated memory was 147.3 MB in the beginning and 202.4 MB in the end (delta: 55.1 MB). Free memory was 92.5 MB in the beginning and 180.2 MB in the end (delta: -87.7 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB.
* RCFGBuilder took 506.26 ms. Allocated memory is still 202.4 MB. Free memory was 179.6 MB in the beginning and 156.7 MB in the end (delta: 22.8 MB). Peak memory consumption was 22.8 MB. Max. memory is 7.1 GB.
* TraceAbstraction took 3276.05 ms. Allocated memory was 202.4 MB in the beginning and 243.3 MB in the end (delta: 40.9 MB). Free memory was 156.0 MB in the beginning and 138.0 MB in the end (delta: 18.1 MB). Peak memory consumption was 59.0 MB. Max. memory is 7.1 GB.
* Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
- CounterExampleResult [Line: 9]: a call of __VERIFIER_error() is reachable
a call of __VERIFIER_error() is reachable
We found a FailurePath:
[L58] CALL, EXPR nondet_tree()
[L18] COND FALSE !(__VERIFIER_nondet_bool())
[L21] struct node *n = (struct node *)malloc(sizeof(struct node));
[L22] n->data = __VERIFIER_nondet_int()
[L23] CALL, EXPR nondet_tree()
[L18] COND TRUE __VERIFIER_nondet_bool()
[L19] return 0;
[L23] RET, EXPR nondet_tree()
[L23] n->left = nondet_tree()
[L24] CALL, EXPR nondet_tree()
[L18] COND TRUE __VERIFIER_nondet_bool()
[L19] return 0;
[L24] RET, EXPR nondet_tree()
[L24] n->right = nondet_tree()
[L25] return n;
[L58] RET, EXPR nondet_tree()
[L58] CALL task(nondet_tree())
[L53] CALL, EXPR max(n)
[L30] COND FALSE !(!n)
[L33] EXPR n->left
[L33] CALL, EXPR max(n->left)
[L30] COND TRUE !n
[L31] return -2147483648;
[L33] RET, EXPR max(n->left)
[L33] int a = max(n->left);
[L34] EXPR n->right
[L34] CALL, EXPR max(n->right)
[L30] COND TRUE !n
[L31] return -2147483648;
[L34] RET, EXPR max(n->right)
[L34] int b = max(n->right);
[L35] COND TRUE a >= b
[L35] return a;
[L53] RET, EXPR max(n)
[L53] int a = max(n);
[L54] CALL check(n, a)
[L41] COND TRUE \read(*n)
[L42] EXPR n->data
[L42] CALL __VERIFIER_assert(n->data <= a)
[L9] COND TRUE !cond
[L9] __VERIFIER_error()
- StatisticsResult: Ultimate Automizer benchmark data
CFG has 8 procedures, 83 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.1s, OverallIterations: 2, TraceHistogramMax: 3, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 72 SDtfs, 174 SDslu, 234 SDs, 0 SdLazy, 583 SolverSat, 81 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=83occurred 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, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 110 NumberOfCodeBlocks, 110 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 32 ConstructedInterpolants, 0 QuantifiedInterpolants, 6272 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...