/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 -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/ldv-regression/mutex_lock_struct.c_1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-86f66a4 [2020-07-07 13:23:38,075 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 13:23:38,078 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 13:23:38,099 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-07 13:23:38,126 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-07 13:23:38,128 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-07 13:23:38,131 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-07 13:23:38,132 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-07 13:23:38,134 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-07 13:23:38,136 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-07 13:23:38,138 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-07 13:23:38,143 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-07 13:23:38,149 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-07 13:23:38,153 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-07 13:23:38,155 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-07 13:23:38,155 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-07 13:23:38,158 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-07 13:23:38,171 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-07 13:23:38,172 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-07 13:23:38,173 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-07 13:23:38,174 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-07 13:23:38,205 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 13:23:38,205 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 13:23:38,206 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 13:23:38,206 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 13:23:38,207 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 13:23:38,207 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 13:23:38,207 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 13:23:38,210 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 13:23:38,211 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 13:23:38,211 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 13:23:38,211 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 13:23:38,211 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 13:23:38,211 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 13:23:38,212 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 13:23:38,212 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 13:23:38,212 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-07 13:23:38,212 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 13:23:38,212 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 13:23:38,213 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 13:23:38,213 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 13:23:38,213 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-07 13:23:38,218 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 13:23:38,219 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-07-07 13:23:38,504 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 13:23:38,527 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 13:23:38,530 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 13:23:38,531 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 13:23:38,532 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 13:23:38,532 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/mutex_lock_struct.c_1.i [2020-07-07 13:23:38,604 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c477d2558/1503912143b24497acdedacb45dfab44/FLAGd6c988366 [2020-07-07 13:23:39,126 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 13:23:39,127 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/mutex_lock_struct.c_1.i [2020-07-07 13:23:39,133 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c477d2558/1503912143b24497acdedacb45dfab44/FLAGd6c988366 [2020-07-07 13:23:39,476 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c477d2558/1503912143b24497acdedacb45dfab44 [2020-07-07 13:23:39,488 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 13:23:39,490 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 13:23:39,491 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 13:23:39,492 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 13:23:39,495 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 13:23:39,497 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,500 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55139f01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39, skipping insertion in model container [2020-07-07 13:23:39,500 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,510 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 13:23:39,535 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 13:23:39,748 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:23:39,760 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 13:23:39,778 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:23:39,796 INFO L208 MainTranslator]: Completed translation [2020-07-07 13:23:39,796 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39 WrapperNode [2020-07-07 13:23:39,797 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 13:23:39,797 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 13:23:39,798 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 13:23:39,798 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 13:23:39,812 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,813 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,906 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,906 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,914 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,916 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,917 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (1/1) ... [2020-07-07 13:23:39,919 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 13:23:39,919 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 13:23:39,920 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 13:23:39,920 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 13:23:39,921 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (1/1) ... No working directory specified, using /storage/repos/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 [2020-07-07 13:23:39,982 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 13:23:39,982 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 13:23:39,983 INFO L138 BoogieDeclarations]: Found implementation of procedure err [2020-07-07 13:23:39,983 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2020-07-07 13:23:39,983 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2020-07-07 13:23:39,983 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 13:23:39,983 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 13:23:39,983 INFO L130 BoogieDeclarations]: Found specification of procedure err [2020-07-07 13:23:39,984 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2020-07-07 13:23:39,984 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-07 13:23:39,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-07 13:23:39,984 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2020-07-07 13:23:39,984 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 13:23:39,984 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-07 13:23:39,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-07 13:23:39,985 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 13:23:39,985 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 13:23:40,212 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 13:23:40,212 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-07 13:23:40,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:23:40 BoogieIcfgContainer [2020-07-07 13:23:40,219 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 13:23:40,221 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 13:23:40,221 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 13:23:40,225 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 13:23:40,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 01:23:39" (1/3) ... [2020-07-07 13:23:40,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@504b9ff3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:23:40, skipping insertion in model container [2020-07-07 13:23:40,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:23:39" (2/3) ... [2020-07-07 13:23:40,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@504b9ff3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:23:40, skipping insertion in model container [2020-07-07 13:23:40,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:23:40" (3/3) ... [2020-07-07 13:23:40,228 INFO L109 eAbstractionObserver]: Analyzing ICFG mutex_lock_struct.c_1.i [2020-07-07 13:23:40,243 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-07 13:23:40,254 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 13:23:40,270 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 13:23:40,299 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 13:23:40,299 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 13:23:40,299 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-07-07 13:23:40,299 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 13:23:40,299 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 13:23:40,300 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 13:23:40,300 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 13:23:40,300 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 13:23:40,319 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states. [2020-07-07 13:23:40,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-07 13:23:40,341 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:23:40,342 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:23:40,343 INFO L427 AbstractCegarLoop]: === Iteration 1 === [errErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:23:40,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:23:40,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1355543847, now seen corresponding path program 1 times [2020-07-07 13:23:40,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:23:40,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626952979] [2020-07-07 13:23:40,381 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:23:40,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:23:40,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:23:40,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:23:40,658 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:23:40,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626952979] [2020-07-07 13:23:40,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:23:40,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-07 13:23:40,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538989611] [2020-07-07 13:23:40,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-07 13:23:40,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:23:40,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-07 13:23:40,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-07 13:23:40,690 INFO L87 Difference]: Start difference. First operand 39 states. Second operand 7 states. [2020-07-07 13:23:40,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:23:40,956 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2020-07-07 13:23:40,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-07 13:23:40,959 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-07-07 13:23:40,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:23:40,970 INFO L225 Difference]: With dead ends: 60 [2020-07-07 13:23:40,970 INFO L226 Difference]: Without dead ends: 25 [2020-07-07 13:23:40,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-07-07 13:23:40,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-07 13:23:41,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-07 13:23:41,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-07 13:23:41,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 24 transitions. [2020-07-07 13:23:41,027 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 24 transitions. Word has length 16 [2020-07-07 13:23:41,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:23:41,028 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 24 transitions. [2020-07-07 13:23:41,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-07 13:23:41,028 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 24 transitions. [2020-07-07 13:23:41,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-07 13:23:41,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:23:41,030 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] [2020-07-07 13:23:41,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 13:23:41,031 INFO L427 AbstractCegarLoop]: === Iteration 2 === [errErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:23:41,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:23:41,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1044574925, now seen corresponding path program 1 times [2020-07-07 13:23:41,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:23:41,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909818081] [2020-07-07 13:23:41,033 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:23:41,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:23:41,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:23:41,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:23:41,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:23:41,252 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:23:41,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909818081] [2020-07-07 13:23:41,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:23:41,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-07-07 13:23:41,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167608690] [2020-07-07 13:23:41,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-07 13:23:41,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:23:41,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-07 13:23:41,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-07-07 13:23:41,257 INFO L87 Difference]: Start difference. First operand 25 states and 24 transitions. Second operand 10 states. [2020-07-07 13:23:41,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:23:41,521 INFO L93 Difference]: Finished difference Result 25 states and 24 transitions. [2020-07-07 13:23:41,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-07 13:23:41,521 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-07-07 13:23:41,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:23:41,522 INFO L225 Difference]: With dead ends: 25 [2020-07-07 13:23:41,523 INFO L226 Difference]: Without dead ends: 0 [2020-07-07 13:23:41,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2020-07-07 13:23:41,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-07 13:23:41,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-07 13:23:41,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-07 13:23:41,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-07 13:23:41,526 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 24 [2020-07-07 13:23:41,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:23:41,526 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-07 13:23:41,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-07 13:23:41,527 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-07 13:23:41,527 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-07 13:23:41,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-07 13:23:41,530 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-07 13:23:41,919 INFO L264 CegarLoopResult]: At program point L27(line 27) the Hoare annotation is: (or (and (= 1 (select (select |#memory_int| mutex_unlock_~b.base) mutex_unlock_~b.offset)) (= |#memory_int| |old(#memory_int)|)) (not (= 1 (select (select |old(#memory_int)| |mutex_unlock_#in~b.base|) |mutex_unlock_#in~b.offset|)))) [2020-07-07 13:23:41,920 INFO L264 CegarLoopResult]: At program point L27-1(line 27) the Hoare annotation is: (or (not (= 1 (select (select |old(#memory_int)| |mutex_unlock_#in~b.base|) |mutex_unlock_#in~b.offset|))) (and (= 1 |mutex_unlock_#t~mem1|) (= 1 (select (select |#memory_int| mutex_unlock_~b.base) mutex_unlock_~b.offset)) (= |#memory_int| |old(#memory_int)|))) [2020-07-07 13:23:41,920 INFO L264 CegarLoopResult]: At program point L27-2(line 27) the Hoare annotation is: (not (= 1 (select (select |old(#memory_int)| |mutex_unlock_#in~b.base|) |mutex_unlock_#in~b.offset|))) [2020-07-07 13:23:41,920 INFO L264 CegarLoopResult]: At program point L27-3(line 27) the Hoare annotation is: (not (= 1 (select (select |old(#memory_int)| |mutex_unlock_#in~b.base|) |mutex_unlock_#in~b.offset|))) [2020-07-07 13:23:41,920 INFO L271 CegarLoopResult]: At program point L27-5(line 27) the Hoare annotation is: true [2020-07-07 13:23:41,921 INFO L271 CegarLoopResult]: At program point L27-6(line 27) the Hoare annotation is: true [2020-07-07 13:23:41,921 INFO L264 CegarLoopResult]: At program point mutex_unlockENTRY(lines 25 29) the Hoare annotation is: (or (not (= 1 (select (select |old(#memory_int)| |mutex_unlock_#in~b.base|) |mutex_unlock_#in~b.offset|))) (= |#memory_int| |old(#memory_int)|)) [2020-07-07 13:23:41,921 INFO L271 CegarLoopResult]: At program point mutex_unlockEXIT(lines 25 29) the Hoare annotation is: true [2020-07-07 13:23:41,921 INFO L271 CegarLoopResult]: At program point mutex_unlockFINAL(lines 25 29) the Hoare annotation is: true [2020-07-07 13:23:41,921 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-07 13:23:41,922 INFO L271 CegarLoopResult]: At program point L-1-1(line -1) the Hoare annotation is: true [2020-07-07 13:23:41,922 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-07 13:23:41,922 INFO L264 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#valid| |old(#valid)|) (= |old(#NULL.base)| |#NULL.base|) (= |#NULL.offset| |old(#NULL.offset)|)) [2020-07-07 13:23:41,922 INFO L271 CegarLoopResult]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2020-07-07 13:23:41,923 INFO L271 CegarLoopResult]: At program point errErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) the Hoare annotation is: true [2020-07-07 13:23:41,923 INFO L271 CegarLoopResult]: At program point errEXIT(lines 12 13) the Hoare annotation is: true [2020-07-07 13:23:41,923 INFO L271 CegarLoopResult]: At program point errENTRY(lines 12 13) the Hoare annotation is: true [2020-07-07 13:23:41,923 INFO L271 CegarLoopResult]: At program point errFINAL(lines 12 13) the Hoare annotation is: true [2020-07-07 13:23:41,923 INFO L264 CegarLoopResult]: At program point mutex_lockENTRY(lines 19 23) the Hoare annotation is: (or (= |#memory_int| |old(#memory_int)|) (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|)))) [2020-07-07 13:23:41,924 INFO L264 CegarLoopResult]: At program point L21(line 21) the Hoare annotation is: (or (and (= |mutex_lock_#in~a.base| mutex_lock_~a.base) (= |mutex_lock_#in~a.offset| mutex_lock_~a.offset) (= |#memory_int| |old(#memory_int)|)) (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|)))) [2020-07-07 13:23:41,924 INFO L264 CegarLoopResult]: At program point mutex_lockEXIT(lines 19 23) the Hoare annotation is: (or (and (= |mutex_lock_#in~a.base| mutex_lock_~a.base) (= (select (select |#memory_int| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|) 1) (= |mutex_lock_#in~a.offset| mutex_lock_~a.offset)) (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|)))) [2020-07-07 13:23:41,924 INFO L264 CegarLoopResult]: At program point L21-1(line 21) the Hoare annotation is: (or (and (= |mutex_lock_#in~a.base| mutex_lock_~a.base) (= |mutex_lock_#in~a.offset| mutex_lock_~a.offset) (= 0 |mutex_lock_#t~mem0|) (= |#memory_int| |old(#memory_int)|)) (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|)))) [2020-07-07 13:23:41,924 INFO L264 CegarLoopResult]: At program point L21-2(line 21) the Hoare annotation is: (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|))) [2020-07-07 13:23:41,924 INFO L264 CegarLoopResult]: At program point L21-3(line 21) the Hoare annotation is: (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|))) [2020-07-07 13:23:41,925 INFO L264 CegarLoopResult]: At program point L21-5(line 21) the Hoare annotation is: (or (and (= |mutex_lock_#in~a.base| mutex_lock_~a.base) (= |mutex_lock_#in~a.offset| mutex_lock_~a.offset) (= 0 |mutex_lock_#t~mem0|) (= |#memory_int| |old(#memory_int)|)) (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|)))) [2020-07-07 13:23:41,925 INFO L264 CegarLoopResult]: At program point L21-6(line 21) the Hoare annotation is: (or (and (= |mutex_lock_#in~a.base| mutex_lock_~a.base) (= |mutex_lock_#in~a.offset| mutex_lock_~a.offset) (= |#memory_int| |old(#memory_int)|)) (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|)))) [2020-07-07 13:23:41,925 INFO L264 CegarLoopResult]: At program point mutex_lockFINAL(lines 19 23) the Hoare annotation is: (or (and (= |mutex_lock_#in~a.base| mutex_lock_~a.base) (= (select (select |#memory_int| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|) 1) (= |mutex_lock_#in~a.offset| mutex_lock_~a.offset)) (not (= 0 (select (select |old(#memory_int)| |mutex_lock_#in~a.base|) |mutex_lock_#in~a.offset|)))) [2020-07-07 13:23:41,925 INFO L271 CegarLoopResult]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2020-07-07 13:23:41,926 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-07 13:23:41,926 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-07 13:23:41,926 INFO L271 CegarLoopResult]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2020-07-07 13:23:41,926 INFO L264 CegarLoopResult]: At program point L33(line 33) the Hoare annotation is: (= |#memory_int| |old(#memory_int)|) [2020-07-07 13:23:41,926 INFO L271 CegarLoopResult]: At program point L33-1(line 33) the Hoare annotation is: true [2020-07-07 13:23:41,927 INFO L264 CegarLoopResult]: At program point mainENTRY(lines 31 43) the Hoare annotation is: (and (= |#valid| |old(#valid)|) (= |#memory_int| |old(#memory_int)|)) [2020-07-07 13:23:41,927 INFO L271 CegarLoopResult]: At program point mainFINAL(lines 31 43) the Hoare annotation is: true [2020-07-07 13:23:41,927 INFO L271 CegarLoopResult]: At program point mainEXIT(lines 31 43) the Hoare annotation is: true [2020-07-07 13:23:41,927 INFO L271 CegarLoopResult]: At program point L38(line 38) the Hoare annotation is: true [2020-07-07 13:23:41,927 INFO L264 CegarLoopResult]: At program point L36(line 36) the Hoare annotation is: (= 1 (select (select |#memory_int| |main_~#m~0.base|) |main_~#m~0.offset|)) [2020-07-07 13:23:41,928 INFO L264 CegarLoopResult]: At program point L34(line 34) the Hoare annotation is: (= 0 (select (select |#memory_int| |main_~#m~0.base|) |main_~#m~0.offset|)) [2020-07-07 13:23:41,944 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-07-07 13:23:41,946 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-07-07 13:23:41,952 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.07 01:23:41 BoogieIcfgContainer [2020-07-07 13:23:41,953 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-07 13:23:41,956 INFO L168 Benchmark]: Toolchain (without parser) took 2465.21 ms. Allocated memory was 138.9 MB in the beginning and 235.9 MB in the end (delta: 97.0 MB). Free memory was 104.2 MB in the beginning and 135.3 MB in the end (delta: -31.1 MB). Peak memory consumption was 65.8 MB. Max. memory is 7.1 GB. [2020-07-07 13:23:41,957 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 138.9 MB. Free memory is still 122.0 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-07 13:23:41,958 INFO L168 Benchmark]: CACSL2BoogieTranslator took 305.88 ms. Allocated memory is still 138.9 MB. Free memory was 104.2 MB in the beginning and 94.4 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-07 13:23:41,960 INFO L168 Benchmark]: Boogie Preprocessor took 121.61 ms. Allocated memory was 138.9 MB in the beginning and 203.4 MB in the end (delta: 64.5 MB). Free memory was 94.4 MB in the beginning and 182.4 MB in the end (delta: -88.0 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. [2020-07-07 13:23:41,961 INFO L168 Benchmark]: RCFGBuilder took 299.62 ms. Allocated memory is still 203.4 MB. Free memory was 182.4 MB in the beginning and 167.0 MB in the end (delta: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 7.1 GB. [2020-07-07 13:23:41,962 INFO L168 Benchmark]: TraceAbstraction took 1731.80 ms. Allocated memory was 203.4 MB in the beginning and 235.9 MB in the end (delta: 32.5 MB). Free memory was 167.0 MB in the beginning and 135.3 MB in the end (delta: 31.7 MB). Peak memory consumption was 64.2 MB. Max. memory is 7.1 GB. [2020-07-07 13:23:41,966 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 138.9 MB. Free memory is still 122.0 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 305.88 ms. Allocated memory is still 138.9 MB. Free memory was 104.2 MB in the beginning and 94.4 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 121.61 ms. Allocated memory was 138.9 MB in the beginning and 203.4 MB in the end (delta: 64.5 MB). Free memory was 94.4 MB in the beginning and 182.4 MB in the end (delta: -88.0 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 299.62 ms. Allocated memory is still 203.4 MB. Free memory was 182.4 MB in the beginning and 167.0 MB in the end (delta: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1731.80 ms. Allocated memory was 203.4 MB in the beginning and 235.9 MB in the end (delta: 32.5 MB). Free memory was 167.0 MB in the beginning and 135.3 MB in the end (delta: 31.7 MB). Peak memory consumption was 64.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - ProcedureContractResult [Line: 25]: Procedure Contract for mutex_unlock Derived contract for procedure mutex_unlock: 1 - ProcedureContractResult [Line: 12]: Procedure Contract for err Derived contract for procedure err: 1 - ProcedureContractResult [Line: 19]: Procedure Contract for mutex_lock [2020-07-07 13:23:41,976 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-07-07 13:23:41,976 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-07-07 13:23:41,977 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-07-07 13:23:41,978 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int Derived contract for procedure mutex_lock: ((a == a && unknown-#memory_int-unknown[a][a] == 1) && a == a) || !(0 == \old(unknown-#memory_int-unknown)[a][a]) - ProcedureContractResult [Line: 31]: Procedure Contract for main Derived contract for procedure main: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 1.2s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 42 SDtfs, 43 SDslu, 89 SDs, 0 SdLazy, 179 SolverSat, 14 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 29 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred 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, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 39 LocationsWithAnnotation, 56 PreInvPairs, 69 NumberOfFragments, 281 HoareAnnotationTreeSize, 56 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 39 FomulaSimplificationsInter, 265 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, 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 correct! Received shutdown request...