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Full Discussion: Defunct Processes
Operating Systems AIX Defunct Processes Post 302234432 by avronius on Tuesday 9th of September 2008 04:31:15 PM
Old 09-09-2008
I have seen this type of problem after a reboot in the following circumstances (granted, it was Solaris, but the principle is the same):
1. Server is booted
2. A new filesystem is mounted, but not updated in vfstab
3. A utility to do some task (like cleanup) is called from the new filesystem
4. Server is rebooted
5. The filesystem is not mounted at boot time
6. The utility is called to perform the cleanup task - but there's nothing there.
7. The application crashes quietly, you end up with defunct processes.
 

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mounting(7)						 Miscellaneous Information Manual					       mounting(7)

NAME
mounting - event signalling that a filesystem is mounting SYNOPSIS
mounting DEVICE=DEVICE MOUNTPOINT=MOUNTPOINT TYPE=TYPE OPTIONS=OPTIONS [ENV]... DESCRIPTION
The mounting event is generated by the mountall(8) daemon when it is about to mount a filesystem. mountall(8) will wait for all services started by this event to be running, all tasks started by this event to have finished and all jobs stopped by this event to be stopped before proceeding with mounting the filesystem. The DEVICE, MOUNTPOINT, TYPE and OPTIONS environment variables contain the values of the fstab(5) fields for this mountpoint. EXAMPLE
A tool that should be run before mounting the /var filesystem might use: start on mounting MOUNTPOINT=/var task SEE ALSO
mounted(7) virtual-filesystems(7) local-filesystems(7) remote-filesystems(7) all-swaps(7) filesystem(7) mountall 2009-12-21 mounting(7)
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