PHP-線程一直不釋放調試

一、現象

1.查看進程是否存在

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.查看進程創建時間

ps -p 2624 -o lstart

STARTED

Sat Oct 24 22:20:03 2015

 

3.查看進程的系統調用

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打開的文件

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、復現

1. 偵聽107.170.249.52的1234端口

nc -l 1234

2.訪問107.170.249.52:1234

curl http://107.170.249.52:1234

3.107.170.249.52接到該請求

4.strace該curl進程

5.與上文所述現象一致

三、解決

　　php curl調用時設置超時

 

轉自：http://www.jianshu.com/p/8a247cae629a