SSL_shutdown() failed (SSL: ... bad write retry)

[vergil]

Of course!

nginx version: nginx/1.19.2
built by gcc 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
built with OpenSSL 1.0.2g  1 Mar 2016
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx
--modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf
--error-log-path=/var/log/nginx/error.log
--http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid
--lock-path=/var/run/nginx.lock
--http-client-body-temp-path=/var/cache/nginx/client_temp
--http-proxy-temp-path=/var/cache/nginx/proxy_temp
--http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp
--http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp
--http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx
--with-compat --with-file-aio --with-threads --with-http_addition_module
--with-http_auth_request_module --with-http_dav_module
--with-http_flv_module --with-http_gunzip_module
--with-http_gzip_static_module --with-http_mp4_module
--with-http_random_index_module --with-http_realip_module
--with-http_secure_link_module --with-http_slice_module
--with-http_ssl_module --with-http_stub_status_module --with-http_sub_module
--with-http_v2_module --with-mail --with-mail_ssl_module --with-stream
--with-stream_realip_module --with-stream_ssl_module
--with-stream_ssl_preread_module --with-cc-opt='-g -O2 -fPIE
-fstack-protector-strong -Wformat -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -fPIC' --with-ld-opt='-Wl,-Bsymbolic-functions -fPIE
-pie -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -pie'


There's two different messages in the logs (http/2 are more rare):

2020/08/13 16:53:27 [crit] 2466#2466: *743603 SSL_shutdown() failed (SSL:
error:1409F07F:SSL routines:ssl3_write_pending:bad write retry) while
closing request, client: XXX.XXX.XXX.XXX, server: XXX.XXX.XXX.XXX:443

2020/08/13 16:34:31 [crit] 2459#2459: *421699 SSL_shutdown() failed (SSL:
error:1409F07F:SSL routines:ssl3_write_pending:bad write retry) while
processing HTTP/2 connection, client: XXX.XXX.XXX.XXX, server:
XXX.XXX.XXX.XXX:443

I'll try to gather debug log with corresponding errors and update this topic
(i'll also gather configuration settings)

Regards,
Alexander.

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,289087,289092#msg-289092