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Full Discussion: Defunct process with dtlogin
Operating Systems AIX Defunct process with dtlogin Post 302517375 by DGPickett on Tuesday 26th of April 2011 03:30:19 PM
Old 04-26-2011
The <defunct> is a child process stub trying to deliver the exit code and status to the parent wait() that has not been called to process SIGCHILD or whatever. It points to some programming error in the parent, that it ignores it's dead children. Wow, wiki: Zombie process - Wikipedia, the free encyclopedia However, Can't kill 'defunct' process - Toolbox for IT Groups says that dtlogin may have inherited the zombies from a crashed parent, so it may be another victim. Perhaps periodic reboots are a good idea?

Also, being a many time burnt veteran, I scan my systems for core files, which users, even developers, may not realize are left behind, indicating some vulnerability in the code. Less core generation is a really nice thing. I used file to find 14 bytes of the executable name, and gdb to do a stack trace, then compressed the core in /tmp (which we periodically clean of old files) and mailed all the info to the group. Removing it allows new core files from different users in the same place, without losing any interesting old core files. Sometimes it takes a while to find the bug, or learn to avoid it!
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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe name ... DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /usr/bin/gdb'' it will create the following two files: -rwxr-xr-x 1 root root 1026675 Jun 7 13:53 /usr/bin/gdb -rwxr-xr-x 1 root root 2304524 May 30 13:02 /usr/bin/gdb~ /usr/bin/gdb~ is the original file and /usr/bin/gdb is the self-uncompressing executable file. You can remove /usr/bin/gdb~ once you are sure that /usr/bin/gdb works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some standard utilities (basename, chmod, ln, mkdir, mktemp, rm, sleep, and tail). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
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