Re: XHR with large payload times out

[Aziz Saleh <azizsaleh@xxxxxxxxx>]

Try playing around with these settings (you seem to already have 2 set):

max_input_time

upload_max_filesize

post_max_size

memory_limit

On Mon, Sep 21, 2020 at 3:41 PM Ed Greenberg <edg@xxxxxxxxxxxxx> wrote:

I have an installation of PHP74 using PHP-FPM where PHP-FPM times out on XHR post requests when the payload (json) is larger than about 130K of text.  Actually, on the last test, 138567.  If I reduce the size of the payload, I can submit just fine.  

Note that this all works with php 7.2. 

Environment is Centos 7, apache 2.4 and PHP74, installed from both remi and on another vm from ius.  Both of these installations exhibit the same behavior. 

I've tried this on both sockets and TCP port 9000. When I tried it on TCP, I was able to run tcpdump and capture the traffic.  Wireshark displayed the TCP stream and there were characters going from apache to php-fpm, and ack packets going the other way, but not a single data packet was captured coming from php-fpm in that TCP session. 

Recentlyl php-fpm logged that 

WARNING: [pool www] child 28337 exited with code 124 after 13504.797955 seconds from start

I reviewed bug 74093 which discussed changing the error code from a certain timeout from 1 to 124, but no indication of why things time out. Google makes me thing that error 124 happens in a variety of cases. 

On the most recent run, php-fpm's error log did not report a 124, but rather...

[21-Sep-2020 14:59:14] NOTICE: Terminating ...
[21-Sep-2020 14:59:14] NOTICE: exiting, bye-bye!
[21-Sep-2020 14:59:14] NOTICE: fpm is running, pid 446
[21-Sep-2020 14:59:14] NOTICE: ready to handle connections
[21-Sep-2020 14:59:14] NOTICE: systemd monitor interval set to 10000ms

Nothing is logged in the slow log.  Nothing logged in www-error.log

I've reviewed the php.ini, php-fpm.conf and www.conf.   I don't see anything regarding uploads other than:

upload_max_filesize = 2M

I've set: 

post_max_size = 500M

(it was 100M) and I was sure I had found it, but no luck. It's behaving the same way (after restarting both httpd and php-fpm.)

Eventually, the request returns 503. This takes at least 20 minutes. My guess is that it's not coming back. Once the request times out, I get 

[proxy_fcgi:error] [pid 32350:tid 140324214953728] (70007)The timeout specified has expired: [client xxx.xxx.xxx.xxx:63388] AH01075: Error dispatching request to : (then the referrer.) 

I can't think of anything else to tell.  The bottom line is that we can't process expected payloads, so can't roll out 7.4. 7.2 is going end of life, so I need to solve this. 

Any help appreciated. 

Ed Greenberg