Re: [Proftpd-user] spinning proftpd processes

[TJ S. <tj...@ca...>]

> >From time to time, I find a proftpd process hung and spinning, i.e. 
> >just looping this system call over and over:

What version of proftpd are you running?  Does this happen for FTPS 
connections, or for plain FTP connections?

> read(14, 0x4115585, 818)                = -1 EAGAIN (Resource temporarily unavailable)
> 
> Looking at the processes open files, I see that fd 14 (and 15) is the server's socket to the client:
> 
> proftpd 16152  ftp   14u  IPv4          491663853               TCP origin.www.upenn.edu:60186->129.21.68.41:4486 (ESTABLISHED)
> proftpd 16152  ftp   15u  IPv4          491663853               TCP origin.www.upenn.edu:60186->129.21.68.41:4486 (ESTABLISHED)
> 
> I think the client connection is long since gone by the time I notice 
> these problems.

No.  If the client was actually gone, then read(2) wouldn't return an 
error, it would return zero to indicate the EOF.

TJ

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

   A man said to the Universe: "Sir, I exist!"

   "However," replied the Universe, "the fact has not created in
   me a sense of obligation."

   	-Stephen Crane

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~