error_log に "AH00574: ap_content_length_filter: apr_bucket_read() failed" と表示されるのはなぜですか?

Issue

• error_log に "AH00574: ap_content_length_filter: apr_bucket_read() failed" と表示されるのはなぜですか?

クライアント (192.168.122.130) で次の curl コマンドを実行します。

$ curl -X POST --data-ascii "hello" http://web1.example.com/cgi-bin/test1.cgi
curl: (18) transfer closed with outstanding read data remaining

/var/log/httpd/access_log

192.168.122.130 - - [18/Oct/2022:16:29:20 +0900] "POST /cgi-bin/test1.cgi HTTP/1.1" 200 - "-" "curl/7.61.1

/var/log/httpd/error_log

[Tue Oct 18 16:29:20.681446 2022] [core:error] [pid 15494:tid 140238290626304] (104)Connection reset by peer: [client 192.168.122.130:40138] AH00574: ap_content_length_filter: apr_bucket_read() failed