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Full Discussion: defunct processes?
Top Forums UNIX for Advanced & Expert Users defunct processes? Post 302423517 by jim mcnamara on Friday 21st of May 2010 08:09:29 AM
Old 05-21-2010
dead process == zombie? What is your definition of a dead process?

The OS cycles the pid of new processes from 1 -> signed short max for most systems.

You should be checking the user/owner of the file and looking for the both the pid and the user. Not just a pid. pids are reused constantly. lsof will tell you if a process still has the file open, if that is the source of your problem.

What OS do you have? Does your system have mandatory locking -- i.e., Apps like weblogic lock directories, do you have something like that running?
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ptree(1)						      General Commands Manual							  ptree(1)

NAME
ptree - prints the process tree hierarchy SYNOPSIS
[pid1|username1 [pid2|username2]...] DESCRIPTION
prints the process tree of all processes that match the specified arguments. While printing the tree, the child processes are indented to the right from their respective parent processes. Options Prints the tree starting from the children of (usually pid 0). The default is to print the tree starting from the children of (pid 1). Operands pid Print the process tree for the process ID number specified by pid. username Print the process tree for all the processes from the user specified by username. Note that only username (and not user ID) can be specified for this instance. If no operands are specified, then prints the process tree of all processes starting from the children of or (if is specified). EXTERNAL INFLUENCES
Environment Variables If is not specified or is null, it defaults to (see lang(5)). EXAMPLES
Print the process tree for pid 100 and for all processes owned by WARNINGS
Process information can change while is running; the tree displayed by is only a snapshot in time. Some data printed for defunct processes is irrelevant. Users of must not rely on the exact field widths and spacing of its output, as these will vary depending on the system and the release of HP-UX. SEE ALSO
pgrep(1), pkill(1), ps(1), fork(2). ptree(1)
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