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From Lazy <lazy...@gmail.com>
Subject Re: [users@httpd] mod_proxy_fcgi + php-fpm + connection reset by peer
Date Sat, 17 Nov 2012 22:50:35 GMT
2012/11/16 Jeff Trawick <trawick@gmail.com>:
> On Fri, Nov 16, 2012 at 9:19 AM, Jeff Trawick <trawick@gmail.com> wrote:
>> On Thu, Nov 15, 2012 at 5:43 PM, Lazy <lazy404@gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> we are using httpd 2.4.3 with php 5.4 running fpm mode.
>>>
>>> requests are passed to fpm using ProxyPassMatch. Everything works fine
>>> except,
>>>
>>> Sometimes database data gets corrupted. All of the data was visible in
>>> the form, but it gets truncated after ajax request commiting changes
>>> gets aborted (shows as aborted in firebug).
>>>
>>> in the access log:
>>> 80.5.x.x - - [15/Nov/2012:14:03:43 +0100] "POST
>>> /xxx,action,pollb,id,958.html HTTP/1.1" 503 299
>>> "https://xxx,action,pollb,id,958.html" "Mozilla/5.0 (Windows NT 6.1;
>>> WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1"
>>>
>>> in the error log:
>>> [Thu Nov 15 14:04:03.140026 2012] [proxy_fcgi:error] [pid 15633:tid
>>> 140459279939328] (104)Connection reset by peer: [client
>>> 80.5.x.x:34541] AH01075: Error dispatching request to :, referer:
>>> https://xxx,action,pollb,id,958.html
>>>
>>> There is haproxy and varnish before httpd, it is also doing ssl.
>>> 80.5.x.x is remote clients ip (we are using mod_remoteip).
>>>
>>> What does the error code exactly mean ? Our client (haproxy) reset ed
>>> the connection ? Or was it php ?
>>
>>
>> PHP dropped the connection.
>>
>> By chance is PHP_FCGI_MAX_REQUESTS set somewhere for the PHP process?  In
>> the old days it defaulted to 500 (exit after 500 requests), which led to
>> exactly this scenario, but with php-fpm it defaults to 0 (don't exit).
>
>
> whoops, the analogous php-fpm  setting is pm.max_requests

this is set to 0, and It happens everytime when connection is aborted

this is the communication betwean apache and php-fpm, when client
aborted the connection (haporxy or telnet)

00:44:35.298623 IP 127.0.0.1.55765 > 127.0.0.1.9000: Flags [S], seq
1371227382, win 32792, options [mss 16396,sackOK,TS val 74917062 ecr
0,nop,wscale 7], length 0
00:44:35.298632 IP 127.0.0.1.9000 > 127.0.0.1.55765: Flags [S.], seq
2312853950, ack 1371227383, win 32768, options [mss 16396,sackOK,TS
val 74917062 ecr 74917062,nop,wscale 7], length 0
00:44:35.298637 IP 127.0.0.1.55765 > 127.0.0.1.9000: Flags [.], ack 1,
win 257, options [nop,nop,TS val 74917062 ecr 74917062], length 0
00:44:35.298655 IP 127.0.0.1.55765 > 127.0.0.1.9000: Flags [P.], seq
1:17, ack 1, win 257, options [nop,nop,TS val 74917062 ecr 74917062],
length 16
00:44:35.298661 IP 127.0.0.1.9000 > 127.0.0.1.55765: Flags [.], ack
17, win 256, options [nop,nop,TS val 74917062 ecr 74917062], length 0
00:44:35.298696 IP 127.0.0.1.55765 > 127.0.0.1.9000: Flags [P.], seq
17:1706, ack 1, win 257, options [nop,nop,TS val 74917062 ecr
74917062], length 1689
00:44:35.298704 IP 127.0.0.1.9000 > 127.0.0.1.55765: Flags [.], ack
1706, win 256, options [nop,nop,TS val 74917062 ecr 74917062], length
0
00:44:35.298711 IP 127.0.0.1.55765 > 127.0.0.1.9000: Flags [P.], seq
1706:1714, ack 1, win 257, options [nop,nop,TS val 74917062 ecr
74917062], length 8
00:44:35.298716 IP 127.0.0.1.9000 > 127.0.0.1.55765: Flags [.], ack
1714, win 256, options [nop,nop,TS val 74917062 ecr 74917062], length
0
00:44:35.298737 IP 127.0.0.1.55765 > 127.0.0.1.9000: Flags [P.], seq
1714:9028, ack 1, win 257, options [nop,nop,TS val 74917062 ecr
74917062], length 7314
00:44:35.298745 IP 127.0.0.1.9000 > 127.0.0.1.55765: Flags [.], ack
9028, win 256, options [nop,nop,TS val 74917062 ecr 74917062], length
0
00:44:55.428420 IP 127.0.0.1.55765 > 127.0.0.1.9000: Flags [F.], seq
9028, ack 1, win 257, options [nop,nop,TS val 74922094 ecr 74917062],
length 0
00:44:55.466463 IP 127.0.0.1.9000 > 127.0.0.1.55765: Flags [.], ack
9029, win 256, options [nop,nop,TS val 74922104 ecr 74922094], length
0
00:44:55.623301 IP 127.0.0.1.9000 > 127.0.0.1.55765: Flags [P.], seq
1:233, ack 9029, win 256, options [nop,nop,TS val 74922143 ecr
74922094], length 232
00:44:55.623322 IP 127.0.0.1.55765 > 127.0.0.1.9000: Flags [R], seq
1371236411, win 0, length 0

when I send

POST /p.php HTTP/1.1
Host: test
User-Agent: HTTPTool/1.0
Content-Type: application/x-www-form-urlencoded
Content-Length: 500

home=C&favoriteaflavor=fli

and close the connection

on mod_fcgid php 5.2 the php script is not executed, ond
mod_proxy_fcgi with php 5.4, script is executed with empty post data


Regards,

Michal Grzedzicki

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