mod_status shows loads of children in Keepalive state with Seconds Since much higher than KeepAliveTimeout
eventually the number of these reaches MaxClients, wedging the server
hung process backtrace like this:
(gdb) bt
#0 0×2814d118 in read () from /usr/lib/libc.so.4
#1 0×2830e69f in ssl_io_hook_read () from /usr/local/libexec/apache/libssl.so
#2 0×806d256 in ap_hook_call_func ()
#3 0×806ce7b in ap_hook_call ()
#4 [...]
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