id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
2182	Nginx doesn't delete temp cache files after a crash	ifel@…		"When Nginx cache module is downloading an object from an upstream, it saves it into a temp file, and once the download is finished, Nginx renames the temp file to a cache one. Nginx does not track these temp files in any persistent storage, nor Cache manager detects them. Thus, if Nginx crashes or gets killed when it's downloading objects, these temp files stays on disk and nothing cleans them up. Since most of modern linux uses systemd, it's a default behavior, if after sending TERM to a process, it does not finish within 60 sec, systemd sends KILL.

There should be some housekeeping mechanism cleaning these stale files up.

Example of these files, it was captured on May 12:
-rw------- 1 nginx nginx 52035584 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935649
-rw------- 1 nginx nginx 52117504 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935663
-rw------- 1 nginx nginx 52592640 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935679
-rw------- 1 nginx nginx 52248576 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935687
-rw------- 1 nginx nginx 41664512 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935688
-rw------- 1 nginx nginx 45858816 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935701
-rw------- 1 nginx nginx 41746432 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935705
-rw------- 1 nginx nginx 42139648 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935708
-rw------- 1 nginx nginx 37421056 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935714
-rw------- 1 nginx nginx 36159488 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935720
-rw------- 1 nginx nginx 36683776 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935730
-rw------- 1 nginx nginx 36847616 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935734
-rw------- 1 nginx nginx 40304640 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935739
-rw------- 1 nginx nginx 24592384 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935743
-rw------- 1 nginx nginx 27017216 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935746
-rw------- 1 nginx nginx 30097408 May 10 12:06 d43aaa174b966c213a8b65a8d53e8c01.0000935754"	enhancement	new	minor		nginx-module	1.14.x				Linux cc001.eag1.facebook.com 5.2.9-228_fbk15_4185_g357f49b36602 #1 SMP Mon Aug 10 09:34:08 PDT 2020 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.14.1
built by gcc 8.2.1 20180905 (Red Hat 8.2.1-3) (GCC)
built with OpenSSL 1.1.1 FIPS  11 Sep 2018 (running with OpenSSL 1.1.1g FIPS  21 Apr 2020)
TLS SNI support enabled
configure arguments: --prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --http-client-body-temp-path=/var/lib/nginx/tmp/client_body --http-proxy-temp-path=/var/lib/nginx/tmp/proxy --http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi --http-uwsgi-temp-path=/var/lib/nginx/tmp/uwsgi --http-scgi-temp-path=/var/lib/nginx/tmp/scgi --pid-path=/run/nginx.pid --lock-path=/run/lock/subsys/nginx --user=nginx --group=nginx --with-file-aio --with-ipv6 --with-http_ssl_module --with-http_v2_module --with-http_realip_module --with-http_addition_module --with-http_xslt_module=dynamic --with-http_image_filter_module=dynamic --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_degradation_module --with-http_slice_module --with-http_stub_status_module --with-http_perl_module=dynamic --with-http_auth_request_module --with-mail=dynamic --with-mail_ssl_module --with-pcre --with-pcre-jit --with-stream=dynamic --with-stream_ssl_module --with-debug --with-cc-opt='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,-E'"