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压测 swoole 卡住

### 问题描述
开了 4 个 worker 进程，压测 几分钟后程序 hang 住，

一个  worker 进程，疯狂接收空字符串，202 是个 tcp 连接描述符
```
[root@ab-app ~]# strace -fp 12482
[pid 12482] recvfrom(202, "", 2, 0, NULL, NULL) = 0
[pid 12482] recvfrom(202, "", 2, 0, NULL, NULL) = 0
[pid 12482] recvfrom(202, "", 2, 0, NULL, NULL) = 0
[pid 12482] recvfrom(202, "", 2, 0, NULL, NULL) = 0
[pid 12482] recvfrom(202, "", 2, 0, NULL, NULL) = 0
[pid 12482] recvfrom(202, "", 2, 0, NULL, NULL) = 0
....
....
...
```

另三个 worker 进程阻塞在这里：
```
[root@ab-app ~]# strace -fp 12483
strace: Process 12483 attached with 5 threads
[pid 12529] futex(0x1e91934, FUTEX_WAIT_PRIVATE, 51520, NULL <unfinished ...>
[pid 12528] futex(0x1e91934, FUTEX_WAIT_PRIVATE, 51522, NULL <unfinished ...>
[pid 12527] futex(0x1e91934, FUTEX_WAIT_PRIVATE, 51518, NULL <unfinished ...>
[pid 12526] futex(0x1e91934, FUTEX_WAIT_PRIVATE, 51524, NULL <unfinished ...>
[pid 12529] <... futex resumed> )       = -1 EAGAIN (Resource temporarily unavailable)
[pid 12528] <... futex resumed> )       = -1 EAGAIN (Resource temporarily unavailable)
[pid 12527] <... futex resumed> )       = -1 EAGAIN (Resource temporarily unavailable)
[pid 12529] futex(0x1e91934, FUTEX_WAIT_PRIVATE, 51524, NULL <unfinished ...>
[pid 12528] futex(0x1e91934, FUTEX_WAIT_PRIVATE, 51524, NULL <unfinished ...>
[pid 12527] futex(0x1e91934, FUTEX_WAIT_PRIVATE, 51524, NULL
```

### Swoole版本，PHP版本，以及操作系统版本信息
swoole：4.4.18
PHP：7.2
centos7

### 你期待的结果是什么？实际看到的错误信息又是什么？
怎么知道以上的发生原因

发布于3年前 · 11 次浏览 · 来自提问