PHP Curl Connection not released, Strace result: Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 1000) = 0 (Tim

First, the phenomenon

1. See if a process exists

Ps-ef | Grep-v ' grep ' |grep-e ' Shell/cron/bonus/cash '

www 2624 1 0 Oct24? 00:00:35/usr/local/bin/php/data1/www/htdocs/hb.e.weibo.com/v2/www/htdocs/index.php--uri=shell/cron/bonus/cash- -get=proc_num=1&proc_total=1--post=

2. View process creation time

Ps-p 2624-o Lstart

Started

Sat OCT 24 22:20:03 2015

3. View system calls to the process

Strace-p 2624

Process 2624 Attached-interrupt to quit

Restart_syscall (... resuming interrupted call ...>) = 0

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 0) = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 1000 = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 0) = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 1000 = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 0) = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 1000 = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 0) = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 1000 = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 0) = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 1000 = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 0) = 0 (Timeout)

Poll ([{fd=5, events=pollin| pollpri| pollrdnorm| Pollrdband}], 1, 1000 = 0 (Timeout)

4. View fd=5 open files

Lsof-d 5 | grep 2624

PHP 2624 www 5u IPv4 3876970637 0t0 TCP 10.74.14.199:45473->host-31.alipay.com:https (established)

Second, reproduce

1. Listening for 107.170.249.52 1234 ports
NC-L 1234

2. Visit 107.170.249.52:1234
Curl http://107.170.249.52:1234

3.107.170.249.52 received the request

4.strace The Curl Process

5. Consistent with the phenomenon described above

Third, solve

Law 1:

Set timeout when Php curl call

Law 2:

Wen/k1ic (author of Jane book)
Original link: http://www.jianshu.com/p/8a247cae629a
Copyright belongs to the author, reproduced please contact the author to obtain authorization, and labeled "Jane book author."