decipher pstack with problem lwp Post: 48526

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Operating Systems Solaris decipher pstack with problem lwp Post 48526 by hosierdm on Tuesday 9th of March 2004 04:34:32 PM

03-09-2004

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decipher pstack with problem lwp

My company has a product that is running on JBoss on Solaris against Oracle 8.1.7. We are having an issue with the server process and high CPU utilization. During this time, and only during this time, we are experiencing database locks that will not let go. A 'ps -L' on the server process indicates several offending light-weight processes. That led me to do a pstack and capture the dump of each of those lwps. However, it's all meaningless to me, and I have been looking everywhere for some sort of help because this problem is killing us! I am going to attach a text file of one example from the pstack. Each offending lwp looks to be indentical in form, and they look very different from all other lwps in the pstack. Any help in deciphering what might be going on or how to interpret the pstack would be most welcome. Thanks in advance!

-David

lwp50474.txt (5.4 KB)

hosierdm

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LEARN ABOUT DEBIAN

pstack

PSTACK(1)						     Linux Programmer's Manual							 PSTACK(1)

NAME

       pstack - print a stack trace of running processes

SYNOPSIS

       pstack pid [...]

DESCRIPTION

       pstack attaches to the active processes named by the pids on the command line, and prints out an execution stack trace, including a hint at
       what the function arguments are.  If symbols exist in the binary (usually the case unless you have run strip(1)), then  symbolic  addresses
       are printed as well.

       If the process is part of a thread group, then pstack will print out a stack trace for each of the threads in the group.

RESTRICTIONS

       pstack currently works only on Linux, only on an x86 machine running 32 bit ELF binaries (64 bit not supported).  Also, for symbolic infor-
       mation, you need to use a GNU compiler to generate your program, and you can't strip symbols from the binaries.	For thread information	to
       be  dumped,  you  have  to  use	the  debug-aware version of the LinuxThreads libpthread.so library.  (To check, run nm(1) on your pthreads
       library, and make sure that the symbol "__pthread_threads_debug" is defined.)  Threads are not supported with the newer NPTL  libpthread.so
       library.

SEE ALSO

       nm(1), ptrace(2)

AUTHORS

       Ross Thompson <ross@whatsis.com>

       Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>

Red Hat Linux							    Feb 25 2002 							 PSTACK(1)