我刚刚将 Apache 网络服务器从 2.2 升级到 2.4。升级后，我在 W 模式下遇到很多卡住的线程。我没有使用 php。即使在静态 html 页面上或通过 Jmeter 进行负载测试时，也会发生卡住的线程。
由于这些卡住的线程，它达到了 MaxRequestWorkers/MaxClients 限制并且服务器变得无响应。内存不是问题。因为即使在服务器崩溃期间，我也有大约 10Gb 的可用内存。
只是为了验证它是否是 Apache，我将它切换回 2.2（旧服务器）并且不再挂起线程！
ServerTokens OS ServerRoot "/etc/httpd" PidFile run/httpd.pid TimeOut 295 KeepAlive Off MaxKeepAliveRequests 100 KeepAliveTimeout 15
StartServers 20 MinSpareServers 15 MaxSpareServers 40 ServerLimit 1024
最大客户数 2048
MaxRequestWorkers 2048
MaxRequestsPerChild 5000
MaxConnectionsPerChild 5000
以下是线程之一上的 pstack：
堆栈 30078
#0 0x00007f0c6536df4d in __lll_lock_wait () from /lib64/libpthread.so.0
#1 0x00007f0c65369d02 in _L_lock_791 () from /lib64/libpthread.so.0
#2 0x00007f0c65369c08 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3 0x00007f0c58e53f4b in yodysMtxLock () from /etc/httpd/modules/libdms2.so
#4 0x00007f0c58e518e6 in yodSlotLock () from /etc/httpd/modules/libdms2.so
#5 0x00007f0c58e50266 in yodStateIncrementSb8 () from /etc/httpd/modules/libdms2.so
#6 0x00007f0c597ca764 in wl_increment_state_metric () from /etc/httpd/modules/mod_wl_24.so
#7 0x00007f0c597c5af9 in request_handler () from /etc/httpd/modules/mod_wl_24.so
#8 0x00007f0c668dc290 in ap_run_handler ()
#9 0x00007f0c668dc7d9 in ap_invoke_handler ()
#10 0x00007f0c668f0bca in ap_process_async_request ()
#11 0x00007f0c668f0ea4 in ap_process_request ()
#12 0x00007f0c668ed7f2 in ap_process_http_connection ()
#13 0x00007f0c668e5890 in ap_run_process_connection ()
#14 0x00007f0c58c2280f in child_main () from /etc/httpd/modules/mod_mpm_prefork.so
#15 0x00007f0c58c22a55 in make_child () from /etc/httpd/modules/mod_mpm_prefork.so
#16 0x00007f0c58c22ab6 in startup_children () from /etc/httpd/modules/mod_mpm_prefork.so
#17 0x00007f0c58c237c0 in prefork_run () from /etc/httpd/modules/mod_mpm_prefork.so
#18 0x00007f0c668c25be in ap_run_mpm ()
#19 0x00007f0c668bbb46 in main ()
任何指导都会有所帮助。