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Date:	Fri, 27 Nov 2009 00:23:32 -0500
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Subject:	Re: Defunct processes with 1.5.25-15; seemingly reproducible
From:	Dave Steenburgh <dave DOT steenburgh AT gmail DOT com>
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cgf wrote:
> Defunct processes are not necessarily indicative of a cygwin problem.
> This could easily be a problem with gnuplot.

Given the sum of my own limited knowledge of the problem at hand (in
summary: every program involved is in my local cygwin directory), I
figured it was best to ask here first.

Dave Steenburgh wrote:
> $ ps
>      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
> ...
>     4164    1288    7684       5504    6 1003 23:49:20 <defunct>
>     5392    3224    5984       6100    5 1003 23:49:06 <defunct>
>     1452    5240    5984       8104    5 1003 23:49:06 <defunct>
>     5240    3224    5984       4532    5 1003 23:49:06 <defunct>
> ...
>
...
> The PIDs seem to be the same every time this happens.  Specifically, I
> have seen 5240 and 1452 every time.  Whether that's significant, I
> don't know.

Now, this is interesting...  I killed those defunct processes with
process explorer, and subsequently confirmed via ps, task manager, and
process explorer that they were no longer running.  I began another
session with gnuplot, and this time there are three:

$ ps
...
     5240    3224    5984       4532    5 1003 23:49:06 <defunct>
     4164    1288    7684       5504    6 1003 23:49:20 <defunct>
     5392    3224    5984       6100    5 1003 23:49:06 <defunct>
...

For each of those, the entire row is identical to a row in my previous
message.  Since I started the session around 14:00, and the last
output file's modification timestamp is 17:21, I'd say the timestamps
for those three processes are not reliable.  Is it possible that the
original defunct processes were never truly killed?  If so, can they
be killed without rebooting?

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