bug: 日志文件出现"async del conn epoll_ctl"，文件fd出现泄漏吗？

[lastpepole]

Ⅰ. Issue Description

QAT_Engine-0.6.19 ，QAT驱动：QAT.L.4.23.0-00001，OpenSSL 1.1.1w

使用tengine+qat硬件卸载时，客户端发起一次HTTPS请求，tengine的logs/error.log都会打印一条如下日志： 2024/04/16 19:20:37 [alert] 38566#0: *408 async del conn epoll_ctl(2, 21) failed (9: Bad file descriptor) while closing request, ... 2024/04/16 19:20:37 [alert] 38566#0: *410 async del conn epoll_ctl(2, 22) failed (9: Bad file descriptor) while closing request, ... 2024/04/16 19:20:37 [alert] 38566#0: *409 async del conn epoll_ctl(2, 30) failed (9: Bad file descriptor) while closing request,...

Ⅱ. Describe what happened

Ⅲ. Describe what you expected to happen

Ⅳ. How to reproduce it (as minimally and precisely as possible)

Ⅴ. Anything else we need to know?

1. If applicable, add nginx debug log doc.

Ⅵ. Environment:

• Tengine version (use sbin/nginx -V): Tengine version: Tengine/2.4.0 nginx version: nginx/1.22.1 built by gcc 4.8.5 built with OpenSSL 1.1.1w 11 Sep 2023 TLS SNI support enabled configure arguments: --prefix=/home/test/third/tengine --with-openssl-async --with-openssl=/usr/local/openssl
• OS (e.g. from /etc/os-release): centos7u5
• Kernel (e.g. uname -a): 5.10
• Others:

[lastpepole]

@lianglli 请问下，这个问题是否能帮忙分析呢？