php curl连接未释放，strace结果：poll([{fd=5, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 1000) = 0 (Timeout)

一、现象

1.查看进程是否存在

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.查看进程创建时间

ps -p 2624 -o lstart

STARTED

Sat Oct 24 22:20:03 2015

3.查看进程的系统调用

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.查看fd=5打开的文件

lsof -d 5 | grep 2624

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

二、复现

1. 侦听107.170.249.52的1234端口

nc -l 1234

2.访问107.170.249.52:1234

curl http://107.170.249.52:1234

3.107.170.249.52接到该请求

4.strace该curl进程

5.与上文所述现象一致

三、解决

法1:

php curl调用时设置超时

法2：

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