wrong $bytes_sent on nginx-1.8.0 if aio threads is enabled

[George .]

Hi all,

I'd like to ask if there are  plans somebody to fix the issue with wrong
$bytes_sent  in aio threads mode. If no, is there a chance to get some hit
or direction, so I can try fix it myself and contribute to better and bug
free nginx?

Thanks in advance,

George

On Fri, May 15, 2015 at 11:37 PM, Valentin V. Bartenev <vbart at nginx.com>
wrote:

> On Friday 15 May 2015 17:45:44 George . wrote:
> > Hi,
> >
> > I found following bug in  nginx-1.8.0:
> >
> > if   aio is configured with threads support - sometime (one in  thousands
> > requests)  $bytes_sent contains only length of the header. I'm attaching
> my
> > nginx.conf, build params and simple python script I'm using the reproduce
> > this issue.
> >
> > Here is the output of test script when the problem appears:
> > .
> > .
> > .
> > received: 101700000 from access_log : 101700000 on 26 iteration
> > 127.0.0.1 - - [15/May/2015 17:27:45] "GET /test HTTP/1.0" 200 -
> > 127.0.0.1 - - [15/May/2015 17:27:47] "GET /test HTTP/1.0" 200 -
> > received: 101700000 from access_log : 101700000 on 27 iteration
> > 127.0.0.1 - - [15/May/2015 17:27:58] "GET /test HTTP/1.0" 200 -
> > 127.0.0.1 - - [15/May/2015 17:28:00] "GET /test HTTP/1.0" 200 -
> > received: 101700000 from access_log : 101690000 on 28 iteration
> > test failed!!
> >
> > also in access_log file"
> >
> > .
> > .
> > .
> > 10170 GET /test HTTP/1.1
> > 10170 GET /test HTTP/1.1
> > 10170 GET /test HTTP/1.1
> > 170 GET /test HTTP/1.1
> > 10170 GET /test HTTP/1.1
> > 10170 GET /test HTTP/1.1
> > .
> > .
> >
>
> Thank you for the report.
>
> It caused by a race condition between sendfile() task completion
> and connection close notifications.  If the latter comes first,
> nginx logs that client prematurely closed connection.
>
> Unfortunately, it's not easy to fix.  I'll look at it later.
>
>   wbr, Valentin V. Bartenev
>
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