APAR status
Closed as program error.
Error description
The logging code can get into a deadlock. Deadlock detected !!! --------------------- Thread "WXS : 2: XSDistributedCommand" is waiting for: com/ibm/ejs/ras/SystemOutStream which is owned by: Thread "WXS : 18: XSDistributedCommand" which is waiting for: com/ibm/ws/bootstrap/WsLogManager which is owned by: Thread "WXS : 2: XSDistributedCommand" (0x0000000002E9C600) "WXS : 2: XSDistributedCommand" Blocked on: com/ibm/ejs/ras/SystemOutStream Owned by: "WXS : 18: XSDistributedCommand" Java callstack: at com/ibm/ejs/ras/SystemOutStream.processEvent(SystemOutStream.jav a:291) at com/ibm/ws/logging/WsHandlerWrapper.publish(WsHandlerWrapper.jav a:43) at java/util/logging/Logger.log(Logger.java:621) at com/ibm/ws/logging/WsLogger.deliverOrBuffer(WsLogger.java:279) at com/ibm/ws/logging/WsLogger.log(WsLogger.java:257) at com/ibm/ws/logging/WsLogger.logp(WsLogger.java:492) at com/ibm/ws/logging/WsLoggerConfigurator.logMessage(WsLoggerConfi gurator.java:540) at com/ibm/ws/logging/WsLoggerConfigurator.access$000(WsLoggerConfi gurator.java:62) at com/ibm/ws/logging/WsLoggerConfigurator$1.run(WsLoggerConfigurat or.java:194) at com/ibm/ws/security/util/AccessController.doPrivileged(AccessCon troller.java:63) at com/ibm/ws/logging/WsLoggerConfigurator.getExtensionPointLogging Configuration(WsLoggerConfigurator.java:179) at com/ibm/ws/logging/WsLoggerConfigurator.getCurrentLoggingConfigu ration(WsLoggerConfigurator.java:300) at com/ibm/ws/logging/WsLoggerConfigurator.getLoggerConfiguration(W sLoggerConfigurator.java:121) at com/ibm/ws/logging/WsLoggerConfigurator.configureLogger(WsLogger Configurator.java:346) at com/ibm/ws/logging/WsLoggerFactoryImpl.createWsLogger(WsLoggerFa ctoryImpl.java:80) at com/ibm/ws/bootstrap/RASDelegator.createWsLogger(RASDelegator.ja va:74) at com/ibm/ws/bootstrap/WsLogManager.getLogger(WsLogManager.java:21 8) (entered lock: com/ibm/ws/bootstrap/WsLogManager@0x0000000680282830, entry count: 1) at java/util/logging/LogManager.demandLogger(LogManager.java:418) at java/util/logging/Logger.demandLogger(Logger.java:354) at java/util/logging/Logger.getLogger(Logger.java:401) at com/ibm/ws/ffdc/impl/WrappingFileOutputStream.<clinit>(WrappingF ileOutputStream.java:79) "WXS : 18: XSDistributedCommand" Blocked on: com/ibm/ws/bootstrap/WsLogManager Owned by: "WXS : 2: XSDistributedCommand" Java callstack: at java/util/logging/LogManager.access$1500(LogManager.java:159) at java/util/logging/LogManager$RootLogger.getHandlers(LogManager.j ava:1445) at com/ibm/ejs/ras/Tr.logToWsHandlers(Tr.java:1689) at com/ibm/ejs/ras/Tr.systemOut(Tr.java:998) at com/ibm/ejs/ras/SystemOutStream.dispatchEvent(SystemOutStream.ja va:363) at com/ibm/ejs/ras/SystemStream.write(SystemStream.java:298) at com/ibm/ejs/ras/SystemOutStream.write(SystemOutStream.java:79) at sun/nio/cs/StreamEncoder.writeBytes(StreamEncoder.java:233) at sun/nio/cs/StreamEncoder.implFlushBuffer(StreamEncoder.java:303) at sun/nio/cs/StreamEncoder.implFlush(StreamEncoder.java:307) at sun/nio/cs/StreamEncoder.flush(StreamEncoder.java:153) (entered lock: java/io/OutputStreamWriter@0x0000000680340FE0, entry count: 1) at java/io/OutputStreamWriter.flush(OutputStreamWriter.java:289) (entered lock: com/ibm/ejs/ras/SystemOutStream@0x0000000680266668, entry count: 1) at org/apache/log4j/helpers/QuietWriter.flush(QuietWriter.java:58)
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere eXtreme Scale. * **************************************************************** * PROBLEM DESCRIPTION: Underloaded threads can get into a * * deadlock. * **************************************************************** * RECOMMENDATION: * **************************************************************** There was a problem identified in the WebSphere Application Server logging code that caused a deadlock under certain circumstances. That problem was fixed under APAR PI21768. This APAR includes that code change in the eXtreme Scale code.
Problem conclusion
An interim fix is available for this APAR.
Temporary fix
Comments
APAR Information
APAR number
PI20987
Reported component name
WS EXTREME SCAL
Reported component ID
5724X6702
Reported release
860
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-06-30
Closed date
2014-07-31
Last modified date
2014-07-31
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WS EXTREME SCAL
Fixed component ID
5724X6702
Applicable component levels
R860 PSY
UP
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSTVLU","label":"WebSphere eXtreme Scale"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"860","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
31 July 2014