Enabling Native Posix Thread Library (NPTL) can cause the WebSphere Application Server Java process to crash
 Technote (troubleshooting)
 
Problem(Abstract)
When you enable Native Posix Thread Library (NPTL), it can cause the IBM WebSphere Application Server Java™ process to crash. This technote describes how to disable NPTL.
 
Cause
Currently, the Java Software Developer Kit (SDK) on Linux for zSeries does not completely support NPTL; however, certain Kernel levels enable NPTL by default.

If the Java process crashes without providing more details about the current thread, the crash could be because of NPTL. Disabling NPTL might solve the Application Server crash.
 
Resolving the problem
The following are possible solutions to this problem. Choose the option that applies to your kernel level:
Upgrade the SDK to 1.3.1 SR7 - 20040527a. The version of the SDK for Linux for zSeries automatically disables NPTL. At this time, SR7 is not available for download. Contact IBM WebSphere Support to get this build of the SDK by calling 800-426-7378 or your local country support.

Workaround
  • Kernel levels 2.4.1 to 2.4.10

    NPTL is enabled by default. To solve the problem, add the following environment variable to the Application Server process:

    LD_ASSUME_KERNEL=2.2.5

  • Kernel levels 2.4.11 to 2.4.19

    NPTL is disabled by default. The problem should not occur at these kernel levels.

  • Kernel levels 2.4.20 or higher

    NPTL is enabled by default. To solve the problem, add the following environment variable to the Application Server process:

    LD_ASSUME_KERNEL=2.4.19
 
Related information
1.3.1 Java SDK - Java Tech Edition for WebSphere Applic
 
 
Cross Reference information
Segment Product Component Platform Version Edition
Application Servers Runtimes for Java Technology Java SDK
 
 


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > Crash
Operating system(s): Linux
Software version: 5.0.2.6
Software edition:
Reference #: 1174444
IBM Group: Software Group
Modified date: Aug 16, 2004