[rsyslog] rsyslog threads questions

[Scott Phuong]

Hi,

I have 3.16.2 which was recently released. I see that under certain
conditions rsyslogd spawns a lot of threads:
 5949 root      11216 S   rsyslogd
 5950 root      11216 S   rsyslogd
 5951 root      11216 S   rsyslogd
 5952 root      11216 S   rsyslogd
 5953 root      11216 S   rsyslogd
 5954 root      11216 S   rsyslogd
 5985 root            Z   [rsyslogd]
 6445 root            Z   [rsyslogd]

I had to kill the rsyslogd and restart it. The first invocation had a
pid of 219 before it had to be killed. The second invocation of pid
which you see above starts with 5949. The difference is the amount of
zombie threads that were invoked by rsyslogd before I had to kill the
first invocation of it.

The question is under what conditions does rsyslogd spawn a new
thread/process and why was it a zombie? I am running rsyslogd in an
embedded environment and not a regular laptop/desktop.  In addition, I
am using busybox and I believe the syslog buffer size is set to
something very low or perhaps none at all. Would this be a factor?
Furthermore, I ran rsyslogd with -c3 and also without -c3 and both
cases happen.

Are these issues already known and fixed in a later version? Sorry, if
I am asking the same questions or have the same issues as previous
people but without the ability to search (or at least, I don't know
how to) the archive, I don't know if my problem/questions has already
been seen and/or resolved.

Thank you very much for your support.

Scott