What does this error log mean?

joe · January 20, 2008, 2:14pm

Hi all
I installed Nginx 0.5.34 on FreeBSD 6.2 (AMD) as a load balance, and I
defined the error log like:

error_log /home/nginx/logs/crit_error.log crit;

Today, I find the following error info from this error log file:

2008/01/20 20:46:46 [error] 2233#0: accept() failed (53: Software caused
connection abort) while accepting new connection on 0.0.0.0:80
2008/01/20 20:47:39 [error] 2233#0: accept() failed (53: Software caused
connection abort) while accepting new connection on 0.0.0.0:80
2008/01/20 20:53:15 [error] 2219#0: accept() failed (53: Software caused
connection abort) while accepting new connection on 0.0.0.0:80
2008/01/20 20:54:33 [error] 2219#0: accept() failed (53: Software caused
connection abort) while accepting new connection on 0.0.0.0:80
2008/01/20 20:54:56 [error] 2219#0: accept() failed (53: Software caused
connection abort) while accepting new connection on 0.0.0.0:80
2008/01/20 20:55:35 [error] 2219#0: accept() failed (53: Software caused
connection abort) while accepting new connection on 0.0.0.0:80
2008/01/20 20:56:11 [error] 2215#0: accept() failed (53: Software caused
connection abort) while accepting new connection on 0.0.0.0:80

The number 2233,2219 should be the PIDs, what does the number 53 mean
here? and what’s the root cause which will trigger this kind of error?

Thanks
Joe

joe · January 20, 2008, 4:00pm

Hello!

On Sun, Jan 20, 2008 at 09:03:27PM +0800, Joe wrote:

2008/01/20 20:47:39 [error] 2233#0: accept() failed (53: Software caused
connection abort) while accepting new connection on 0.0.0.0:80

The number 2233,2219 should be the PIDs, what does the number 53 mean here?
and what’s the root cause which will trigger this kind of error?

http://www.sysoev.ru/nginx/docs/faq.html (in russian)

This is non-critical error caused by client closed connection
befor nginx accept()'ed it. Number 53 here is error number, see
errno(2) manpage for details.

Maxim D.

joe · January 21, 2008, 2:30pm

Hello!

On Mon, Jan 21, 2008 at 08:23:37PM +0800, Joe wrote:

2008/01/20 20:54:56 [error] 2219#0: accept() failed (53: Software caused

Today, I find the following kind of error:
2008/01/21 12:59:45 [alert] 13288#0: *27192854 socket() failed (55: No
buffer space available) while connecting to upstream, client: …
2008/01/21 12:59:45 [alert] 13288#0: *27192754 socket() failed (55: No
buffer space available) while connecting to upstream, client: …
2008/01/21 12:59:45 [alert] 13288#0: *27193191 socket() failed (55: No
buffer space available) while connecting to upstream, client: …

Do you know what’s the number 27192854, 27192754, 27193191 mean? also what

This is internal connection numbers. They are usefull only when
you are debugging nginx and want to find log lines related to
specific connection.

does ‘No buffer space available’ mean? does it mean my server has no enough
memory or any others?

[quote from intro(2)]
55 ENOBUFS No buffer space available. An operation on a socket or
pipe
was not performed because the system lacked sufficient
buffer
space or because a queue was full.
[end quote]

Server has no buffer space. Check ‘netstat -m’ output. You
probably have to adjust number of mbufs allocated, see tuning(7).

BTW, where can I get the detailed error info description document? I
searched the Nginx official Wiki page, but I still cannot find it.

Basically, you should use your OS documentation to find out what’s
happening. Under FreeBSD - consult errno(2) manual page where all
system error codes described.

There is no such a thing as ‘detaild error description’ for nginx, and
if you want to know exactly what does mean you have to
look into source code. In most cases it’s not needed though - errors
are self-explanatory and mostly refer to system errors nginx
have nothing to do with (and so - see above).

Maxim D.

joe · January 21, 2008, 1:35pm

Maxim D. wrote:

Today, I find the following error info from this error log file:
caused connection abort) while accepting new connection on 0.0.0.0:80
This is non-critical error caused by client closed connection befor
nginx accept()'ed it. Number 53 here is error number, see errno(2)
manpage for details.

Maxim D.

Hi Dounin
Thanks for your answer.

Today, I find the following kind of error:
2008/01/21 12:59:45 [alert] 13288#0: *27192854 socket() failed (55: No
buffer space available) while connecting to upstream, client: …
2008/01/21 12:59:45 [alert] 13288#0: *27192754 socket() failed (55: No
buffer space available) while connecting to upstream, client: …
2008/01/21 12:59:45 [alert] 13288#0: *27193191 socket() failed (55: No
buffer space available) while connecting to upstream, client: …

Do you know what’s the number 27192854, 27192754, 27193191 mean? also
what does ‘No buffer space available’ mean? does it mean my server has
no enough memory or any others?

BTW, where can I get the detailed error info description document? I
searched the Nginx official Wiki page, but I still cannot find it.

Your help is really appreciated!

Thanks
Joe