java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/cade18-smtinterpol/svcomp-DerefFreeMemtrack-32bit-Automizer_Camel.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/memleaks_test1_false-valid-free.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-c17473d-m [2018-02-04 13:45:55,592 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-02-04 13:45:55,593 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-02-04 13:45:55,602 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-02-04 13:45:55,603 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-02-04 13:45:55,603 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-02-04 13:45:55,604 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-02-04 13:45:55,605 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-02-04 13:45:55,606 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-02-04 13:45:55,607 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-02-04 13:45:55,608 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-02-04 13:45:55,608 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-02-04 13:45:55,609 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-02-04 13:45:55,609 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-02-04 13:45:55,610 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-02-04 13:45:55,612 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-02-04 13:45:55,613 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-02-04 13:45:55,615 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-02-04 13:45:55,616 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-02-04 13:45:55,616 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-02-04 13:45:55,618 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-02-04 13:45:55,622 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-02-04 13:45:55,622 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-02-04 13:45:55,623 INFO L98 SettingsManager]: Beginning loading settings from /home/ultimate/work/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/cade18-smtinterpol/svcomp-DerefFreeMemtrack-32bit-Automizer_Camel.epf [2018-02-04 13:45:55,632 INFO L110 SettingsManager]: Loading preferences was successful [2018-02-04 13:45:55,632 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-02-04 13:45:55,633 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-02-04 13:45:55,633 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-02-04 13:45:55,633 INFO L133 SettingsManager]: * Use SBE=true [2018-02-04 13:45:55,633 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-02-04 13:45:55,633 INFO L133 SettingsManager]: * sizeof long=4 [2018-02-04 13:45:55,634 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-02-04 13:45:55,634 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-02-04 13:45:55,634 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-02-04 13:45:55,634 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-02-04 13:45:55,634 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-02-04 13:45:55,634 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-02-04 13:45:55,634 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-02-04 13:45:55,635 INFO L133 SettingsManager]: * sizeof long double=12 [2018-02-04 13:45:55,635 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-02-04 13:45:55,635 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-02-04 13:45:55,635 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-02-04 13:45:55,635 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-02-04 13:45:55,635 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-02-04 13:45:55,636 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-02-04 13:45:55,636 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-02-04 13:45:55,636 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-02-04 13:45:55,636 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-02-04 13:45:55,663 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-02-04 13:45:55,673 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-02-04 13:45:55,676 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-02-04 13:45:55,677 INFO L271 PluginConnector]: Initializing CDTParser... [2018-02-04 13:45:55,677 INFO L276 PluginConnector]: CDTParser initialized [2018-02-04 13:45:55,678 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /home/ultimate/work/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/memleaks_test1_false-valid-free.i [2018-02-04 13:45:55,836 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-02-04 13:45:55,837 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-02-04 13:45:55,838 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-02-04 13:45:55,838 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-02-04 13:45:55,843 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-02-04 13:45:55,844 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:55,846 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5fc89e21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55, skipping insertion in model container [2018-02-04 13:45:55,847 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:55,860 INFO L153 Dispatcher]: Using SV-COMP mode [2018-02-04 13:45:55,895 INFO L153 Dispatcher]: Using SV-COMP mode [2018-02-04 13:45:55,970 INFO L450 PostProcessor]: Settings: Checked method=main [2018-02-04 13:45:55,979 INFO L450 PostProcessor]: Settings: Checked method=main [2018-02-04 13:45:55,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55 WrapperNode [2018-02-04 13:45:55,982 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-02-04 13:45:55,983 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-02-04 13:45:55,983 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-02-04 13:45:55,983 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-02-04 13:45:55,991 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:55,991 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:55,997 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:55,997 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:55,999 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:56,000 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:56,001 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (1/1) ... [2018-02-04 13:45:56,002 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-02-04 13:45:56,003 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-02-04 13:45:56,003 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-02-04 13:45:56,003 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-02-04 13:45:56,004 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (1/1) ... No working directory specified, using /home/ultimate/work/ultimate/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 [2018-02-04 13:45:56,038 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-02-04 13:45:56,038 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-02-04 13:45:56,038 INFO L136 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2018-02-04 13:45:56,038 INFO L136 BoogieDeclarations]: Found implementation of procedure entry_point [2018-02-04 13:45:56,038 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-02-04 13:45:56,038 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-02-04 13:45:56,038 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-02-04 13:45:56,038 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-02-04 13:45:56,038 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-02-04 13:45:56,038 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-02-04 13:45:56,039 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-02-04 13:45:56,039 INFO L128 BoogieDeclarations]: Found specification of procedure ldv_malloc [2018-02-04 13:45:56,039 INFO L128 BoogieDeclarations]: Found specification of procedure entry_point [2018-02-04 13:45:56,039 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-02-04 13:45:56,039 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-02-04 13:45:56,039 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-02-04 13:45:56,134 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-02-04 13:45:56,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.02 01:45:56 BoogieIcfgContainer [2018-02-04 13:45:56,134 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-02-04 13:45:56,135 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-02-04 13:45:56,135 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-02-04 13:45:56,136 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-02-04 13:45:56,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.02 01:45:55" (1/3) ... [2018-02-04 13:45:56,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59a37349 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.02 01:45:56, skipping insertion in model container [2018-02-04 13:45:56,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:45:55" (2/3) ... [2018-02-04 13:45:56,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59a37349 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.02 01:45:56, skipping insertion in model container [2018-02-04 13:45:56,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.02 01:45:56" (3/3) ... [2018-02-04 13:45:56,139 INFO L107 eAbstractionObserver]: Analyzing ICFG memleaks_test1_false-valid-free.i [2018-02-04 13:45:56,145 INFO L128 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-02-04 13:45:56,148 INFO L140 ceAbstractionStarter]: Appying trace abstraction to program that has 5 error locations. [2018-02-04 13:45:56,170 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-02-04 13:45:56,170 INFO L323 AbstractCegarLoop]: Hoare is false [2018-02-04 13:45:56,171 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-02-04 13:45:56,171 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-02-04 13:45:56,171 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-02-04 13:45:56,171 INFO L327 AbstractCegarLoop]: Difference is false [2018-02-04 13:45:56,171 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-02-04 13:45:56,171 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-02-04 13:45:56,172 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-02-04 13:45:56,183 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-02-04 13:45:56,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-02-04 13:45:56,191 INFO L343 BasicCegarLoop]: Found error trace [2018-02-04 13:45:56,192 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-04 13:45:56,192 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation, entry_pointErr0RequiresViolation, entry_pointErr1RequiresViolation, entry_pointErr2RequiresViolation, entry_pointErr3RequiresViolation]=== [2018-02-04 13:45:56,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1168738877, now seen corresponding path program 1 times [2018-02-04 13:45:56,197 INFO L213 onRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-02-04 13:45:56,197 INFO L67 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-02-04 13:45:56,231 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,231 INFO L109 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-02-04 13:45:56,231 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-02-04 13:45:56,262 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-02-04 13:45:56,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 13:45:56,312 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-02-04 13:45:56,313 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-02-04 13:45:56,314 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-02-04 13:45:56,321 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-02-04 13:45:56,322 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-02-04 13:45:56,323 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2018-02-04 13:45:56,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-02-04 13:45:56,376 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-02-04 13:45:56,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-02-04 13:45:56,442 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-02-04 13:45:56,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-02-04 13:45:56,450 INFO L225 Difference]: With dead ends: 31 [2018-02-04 13:45:56,450 INFO L226 Difference]: Without dead ends: 28 [2018-02-04 13:45:56,453 INFO L554 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-02-04 13:45:56,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-02-04 13:45:56,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-02-04 13:45:56,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-02-04 13:45:56,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-02-04 13:45:56,473 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 13 [2018-02-04 13:45:56,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-02-04 13:45:56,474 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-02-04 13:45:56,474 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-02-04 13:45:56,474 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-02-04 13:45:56,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-02-04 13:45:56,474 INFO L343 BasicCegarLoop]: Found error trace [2018-02-04 13:45:56,474 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-04 13:45:56,474 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation, entry_pointErr0RequiresViolation, entry_pointErr1RequiresViolation, entry_pointErr2RequiresViolation, entry_pointErr3RequiresViolation]=== [2018-02-04 13:45:56,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1168738878, now seen corresponding path program 1 times [2018-02-04 13:45:56,474 INFO L213 onRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-02-04 13:45:56,475 INFO L67 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-02-04 13:45:56,475 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,475 INFO L109 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-02-04 13:45:56,476 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-02-04 13:45:56,485 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-02-04 13:45:56,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 13:45:56,518 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-02-04 13:45:56,518 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-02-04 13:45:56,519 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-02-04 13:45:56,520 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-02-04 13:45:56,520 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-02-04 13:45:56,520 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 5 states. [2018-02-04 13:45:56,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-02-04 13:45:56,557 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-02-04 13:45:56,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-02-04 13:45:56,558 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-02-04 13:45:56,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-02-04 13:45:56,559 INFO L225 Difference]: With dead ends: 30 [2018-02-04 13:45:56,560 INFO L226 Difference]: Without dead ends: 30 [2018-02-04 13:45:56,560 INFO L554 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-02-04 13:45:56,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-02-04 13:45:56,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2018-02-04 13:45:56,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-02-04 13:45:56,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-02-04 13:45:56,564 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 13 [2018-02-04 13:45:56,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-02-04 13:45:56,564 INFO L432 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-02-04 13:45:56,564 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-02-04 13:45:56,564 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-02-04 13:45:56,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-02-04 13:45:56,565 INFO L343 BasicCegarLoop]: Found error trace [2018-02-04 13:45:56,565 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-04 13:45:56,565 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation, entry_pointErr0RequiresViolation, entry_pointErr1RequiresViolation, entry_pointErr2RequiresViolation, entry_pointErr3RequiresViolation]=== [2018-02-04 13:45:56,565 INFO L82 PathProgramCache]: Analyzing trace with hash -602021893, now seen corresponding path program 1 times [2018-02-04 13:45:56,565 INFO L213 onRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-02-04 13:45:56,565 INFO L67 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-02-04 13:45:56,567 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,567 INFO L109 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-02-04 13:45:56,567 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-02-04 13:45:56,580 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-02-04 13:45:56,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 13:45:56,630 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-02-04 13:45:56,630 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-02-04 13:45:56,631 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-02-04 13:45:56,631 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-02-04 13:45:56,631 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-02-04 13:45:56,631 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 6 states. [2018-02-04 13:45:56,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-02-04 13:45:56,668 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-02-04 13:45:56,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-02-04 13:45:56,669 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2018-02-04 13:45:56,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-02-04 13:45:56,670 INFO L225 Difference]: With dead ends: 27 [2018-02-04 13:45:56,670 INFO L226 Difference]: Without dead ends: 27 [2018-02-04 13:45:56,670 INFO L554 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-02-04 13:45:56,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-02-04 13:45:56,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-02-04 13:45:56,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-02-04 13:45:56,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-02-04 13:45:56,673 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 15 [2018-02-04 13:45:56,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-02-04 13:45:56,673 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-02-04 13:45:56,673 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-02-04 13:45:56,673 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-02-04 13:45:56,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-02-04 13:45:56,674 INFO L343 BasicCegarLoop]: Found error trace [2018-02-04 13:45:56,674 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-04 13:45:56,674 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation, entry_pointErr0RequiresViolation, entry_pointErr1RequiresViolation, entry_pointErr2RequiresViolation, entry_pointErr3RequiresViolation]=== [2018-02-04 13:45:56,674 INFO L82 PathProgramCache]: Analyzing trace with hash -602021892, now seen corresponding path program 1 times [2018-02-04 13:45:56,674 INFO L213 onRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-02-04 13:45:56,675 INFO L67 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-02-04 13:45:56,676 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,676 INFO L109 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-02-04 13:45:56,676 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-02-04 13:45:56,685 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-02-04 13:45:56,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 13:45:56,733 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-02-04 13:45:56,733 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-02-04 13:45:56,734 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-02-04 13:45:56,734 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-02-04 13:45:56,734 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-02-04 13:45:56,734 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 6 states. [2018-02-04 13:45:56,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-02-04 13:45:56,773 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-02-04 13:45:56,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-02-04 13:45:56,773 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2018-02-04 13:45:56,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-02-04 13:45:56,773 INFO L225 Difference]: With dead ends: 26 [2018-02-04 13:45:56,773 INFO L226 Difference]: Without dead ends: 26 [2018-02-04 13:45:56,773 INFO L554 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-02-04 13:45:56,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-02-04 13:45:56,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-02-04 13:45:56,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-02-04 13:45:56,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-02-04 13:45:56,775 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 15 [2018-02-04 13:45:56,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-02-04 13:45:56,776 INFO L432 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-02-04 13:45:56,776 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-02-04 13:45:56,776 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-02-04 13:45:56,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-02-04 13:45:56,776 INFO L343 BasicCegarLoop]: Found error trace [2018-02-04 13:45:56,776 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-04 13:45:56,776 INFO L371 AbstractCegarLoop]: === Iteration 5 === [mainErr0EnsuresViolation, entry_pointErr0RequiresViolation, entry_pointErr1RequiresViolation, entry_pointErr2RequiresViolation, entry_pointErr3RequiresViolation]=== [2018-02-04 13:45:56,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1482809507, now seen corresponding path program 1 times [2018-02-04 13:45:56,776 INFO L213 onRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-02-04 13:45:56,776 INFO L67 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-02-04 13:45:56,777 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,777 INFO L109 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-02-04 13:45:56,777 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-04 13:45:56,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-02-04 13:45:56,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-02-04 13:45:56,810 INFO L410 BasicCegarLoop]: Counterexample might be feasible [2018-02-04 13:45:56,823 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.02 01:45:56 BoogieIcfgContainer [2018-02-04 13:45:56,823 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-02-04 13:45:56,823 INFO L168 Benchmark]: Toolchain (without parser) took 986.93 ms. Allocated memory was 402.7 MB in the beginning and 609.7 MB in the end (delta: 207.1 MB). Free memory was 359.5 MB in the beginning and 541.0 MB in the end (delta: -181.5 MB). Peak memory consumption was 25.6 MB. Max. memory is 5.3 GB. [2018-02-04 13:45:56,824 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 402.7 MB. Free memory is still 366.1 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-02-04 13:45:56,824 INFO L168 Benchmark]: CACSL2BoogieTranslator took 144.79 ms. Allocated memory is still 402.7 MB. Free memory was 359.5 MB in the beginning and 347.6 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 5.3 GB. [2018-02-04 13:45:56,824 INFO L168 Benchmark]: Boogie Preprocessor took 19.52 ms. Allocated memory is still 402.7 MB. Free memory was 347.6 MB in the beginning and 345.0 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 5.3 GB. [2018-02-04 13:45:56,825 INFO L168 Benchmark]: RCFGBuilder took 131.72 ms. Allocated memory is still 402.7 MB. Free memory was 345.0 MB in the beginning and 332.3 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 5.3 GB. [2018-02-04 13:45:56,825 INFO L168 Benchmark]: TraceAbstraction took 688.27 ms. Allocated memory was 402.7 MB in the beginning and 609.7 MB in the end (delta: 207.1 MB). Free memory was 330.9 MB in the beginning and 541.0 MB in the end (delta: -210.1 MB). There was no memory consumed. Max. memory is 5.3 GB. [2018-02-04 13:45:56,826 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 402.7 MB. Free memory is still 366.1 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 144.79 ms. Allocated memory is still 402.7 MB. Free memory was 359.5 MB in the beginning and 347.6 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 19.52 ms. Allocated memory is still 402.7 MB. Free memory was 347.6 MB in the beginning and 345.0 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 5.3 GB. * RCFGBuilder took 131.72 ms. Allocated memory is still 402.7 MB. Free memory was 345.0 MB in the beginning and 332.3 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 5.3 GB. * TraceAbstraction took 688.27 ms. Allocated memory was 402.7 MB in the beginning and 609.7 MB in the end (delta: 207.1 MB). Free memory was 330.9 MB in the beginning and 541.0 MB in the end (delta: -210.1 MB). There was no memory consumed. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: free of unallocated memory possible free of unallocated memory possible We found a FailurePath: [L1441] CALL entry_point() [L1435] CALL, EXPR ldv_malloc(sizeof(int)) VAL [\old(size)=4] [L1073] COND TRUE __VERIFIER_nondet_int() [L1074] EXPR, FCALL malloc(size) VAL [\old(size)=4, malloc(size)={6:0}, size=4] [L1074] RET return malloc(size); VAL [\old(size)=4, \result={6:0}, malloc(size)={6:0}, size=4] [L1435] EXPR ldv_malloc(sizeof(int)) VAL [ldv_malloc(sizeof(int))={6:0}] [L1435] int *p = (int *)ldv_malloc(sizeof(int)); [L1436] FCALL free(p) VAL [p={6:0}] [L1437] FCALL free(p) VAL [p={6:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 27 locations, 5 error locations. UNSAFE Result, 0.6s OverallTime, 5 OverallIterations, 1 TraceHistogramMax, 0.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 85 SDtfs, 17 SDslu, 245 SDs, 0 SdLazy, 83 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 3 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 72 NumberOfCodeBlocks, 72 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 52 ConstructedInterpolants, 0 QuantifiedInterpolants, 1292 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 4 InterpolantComputations, 4 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /home/ultimate/work/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memleaks_test1_false-valid-free.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel.epf_AutomizerC.xml/Csv-Benchmark-0-2018-02-04_13-45-56-829.csv Written .csv to /home/ultimate/work/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memleaks_test1_false-valid-free.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-02-04_13-45-56-829.csv Received shutdown request...