id summary reporter owner description type status priority milestone component version resolution keywords cc uname nginx_version 2338 why nginx output status 200 in access.log when client get unexpected data length manmanjyb@… "in a special envirment, the net quality between client and nginx is so bad,so it's easy to cause send_timeout,then nginx active close the tcp chain,then, client report error,it said recived less data length than expected. when this happened,i find two abnornal thing: 1) access log status 200 2) the parameter event_list is null is epoll_wait call some thing abort reproduce（it it easy to do: such as set send_timeout 1ms,at here send_timeout is 500ms) ============nginx debug log========================== 2022/03/20 17:41:04 [debug] 5379#0: timer delta: 0 2022/03/20 17:41:04 [debug] 5379#0: worker cycle 2022/03/20 17:41:04 [debug] 5379#0: epoll timer: 500 2022/03/20 17:41:05 [debug] 5379#0: timer delta: 503 2022/03/20 17:41:05 [debug] 5379#0: *204227 event timer del: 3: 1617949126 2022/03/20 17:41:05 [debug] 5379#0: *204227 http run request: ""/android/repository/maven-public/com/***/duapp/modules/du_product/4.90.0-SNAPSHOT/du_product-4.90.0-20220317.134753-11.aar?"" 2022/03/20 17:41:05 [debug] 5379#0: *204227 http writer handler: ""/android/repository/maven-public/com/***/duapp/modules/du_product/4.90.0-SNAPSHOT/du_product-4.90.0-20220317.134753-11.aar?"" 2022/03/20 17:41:05 [info] 5379#0: *204227 client timed out (110: Connection timed out) while sending to client, client: 10.176.51.248, server: ******.com, request: ""GET /android/repository/maven-public/com/***/duapp/modules/du_product/4.90.0-SNAPSHOT/du_product-4.90.0-20220317.134753-11.aar HTTP/1.1"", upstream: ""http://127.0.0.1:8888/android/repository/maven-public/com/***/duapp/modules/du_product/4.90.0-SNAPSHOT/du_product-4.90.0-20220317.134753-11.aar"", host: ""******.com"" 2022/03/20 17:41:05 [debug] 5379#0: *204227 http finalize request: 408, ""/android/repository/maven-public/com/***/duapp/modules/du_product/4.90.0-SNAPSHOT/du_product-4.90.0-20220317.134753-11.aar?"" a:1, c:1 =========================strace======================== 6186 19:33:10.563672 epoll_wait(74, [{EPOLLIN|EPOLLOUT, {u32=577594800, u64=140205490005424}}], 512, 899991) = 1 <0.000018> 6186 19:33:10.563718 readv(5, [{""s\252s\2528\17\216\356\226OQ\300\23Ygyb\5d\17\264\236 \226\313/\346c\351\272\212\372""..., 45153865}, {"""", 1048576}], 2) = 189792 <0.000127> 6186 19:33:10.563881 writev(4, [{""P\272\33\367\220uzP;z\247\351\325Z~\3364\306\217\323\370M\5;\326\352\336*U\32\233\232""..., 7464727}], 1) = 6589380 <0.001301> 6186 19:33:10.565215 writev(4, [{""\1\2\324\340 \31<\263\346{\366:I\305@\321\263\247Rr\263\17k\247:\220\224&\366\211'|""..., 875347}], 1) = -1 EAGAIN (Resource temporarily unavailable) <0.000016> 6186 19:33:10.565272 epoll_wait(74, [], 512, 500) = 0 <0.500306> 6186 19:33:11.065658 write(3, ""2022/03/20 19:33:11 [info] 6186#""..., 540) = 540 <0.000033> 6186 19:33:11.065760 write(13, ""2022-03-20T19:33:11+08:00 | 200 ""..., 308) = 308 <0.000033> 6186 19:33:11.065823 munmap(0x7f841e8d5000, 52432896) = 0 <0.000688> 6186 19:33:11.066541 close(4) = 0 <0.000026> 6186 19:33:11.066593 epoll_wait(74, [{EPOLLIN, {u32=577593360, u64=140205490003984}}], 512, 59498) = 1 <0.720498> 6185 19:33:11.787134 <... epoll_wait resumed> [{EPOLLIN, {u32=577593360, u64=140205490003984}}], 512, -1) = 1 <1.233548> 6184 19:33:11.787165 <... epoll_wait resumed> [{EPOLLIN, {u32=577593360, u64=140205490003984}}], 512, -1) = 1 <1.233567> ==================access.log==================================== 2022-03-20T19:33:11+08:00 | 200 | 0.512 | 10.176.51.248 | 7638200 | ***.com | http | GET | ****/modules/du_product/4.90.0-SNAPSHOT/du_product-4.90.0-20220317.134753-11.aar | - | - | 127.0.0.1:8888 | 0.010 | 200 | - | Wget/1.21.2 | - 2022-03-20T19:33:14+08:00 | 206 | 0.007 | 10.176.51.248 | 876088 | ***.com | http | GET | ****/modules/du_product/4.90.0-SNAPSHOT/du_product-4.90.0-20220317.134753-11.aar | - | - | 127.0.0.1:8888 | 0.007 | 206 | - | Wget/1.21.2 | -" defect closed minor documentation 1.16.x invalid epoll_wait 3.10.0-957.21.3.el7.x86_64 #1 SMP Tue Jun 18 16:35:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux "nginx version: nginx/1.16.1 built by gcc 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC) built with OpenSSL 1.0.2k-fips 26 Jan 2017 TLS SNI support enabled"