Hi all, I'm experiencing odd behavior with some larger HTTP file downloads from my site. The files will download for a seemingly random amount of bytes then the connection freezes until "send_timeout" expires, at which point the error log shows "client timed out (110: Connection timed out) while sending response to client".
A tcpdump shows both ends successfully passing packets with no packet loss. nginx is pretty stock from the nginx.org repository, no 3rd party modules or complex options, mostly static files and fastcgi / PHP. The behavior is very intermittent, but happens regardless of client browser / IP / requested file. I was able to captured a debug log when this happened, it is available at https://hastebin.com/tevusuhobe.m (some rewrite details and variables have been omitted) # nginx -V nginx version: nginx/1.10.2 built by gcc 4.9.2 (Debian 4.9.2-10) built with OpenSSL 1.0.1t 3 May 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-file-aio --with-threads --with-ipv6 --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_ssl_module --with-cc-opt='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -Wl,--as-needed' sendfile, tcp_nopush, tcp_nodelay are enabled. accept_mutex, aio is disabled. Linux karak 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux I've also tried mainline nginx/1.11.9 from the nginx.org repository and the problem persisted. Any advice on what I should be looking at to resolve this would be very welcome! Regards, Richard.
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