https://bz.apache.org/bugzilla/show_bug.cgi?id=61616
--- Comment #44 from Carsten Wolff <cars...@wolffcarsten.de> --- Created attachment 35737 --> https://bz.apache.org/bugzilla/attachment.cgi?id=35737&action=edit fixes a busy loop trying to shutdown a disconnected socket (In reply to Carsten Wolff from comment #43) > So it definitely seems to be necessary that the frontend connection uses SSL > for the stalls to be triggered. I need to retract that statement. With "v10 and v2 applied + configuration from comment#24", another problem arises, when many concurrent connections are made through proxy_connect: Now and then a process (prefork mpm) will stay in a busy loop, doing this over and over again: shutdown(30, 1 /* send */) = -1 ENOTCONN (Transport endpoint is not connected) epoll_ctl(31, EPOLL_CTL_DEL, 30, {0, {u32=0, u64=0}}) = 0 epoll_wait(31, {{EPOLLOUT|EPOLLERR|EPOLLHUP, {u32=359204392, u64=140724962657832}}}, 2, 60000) = 1 epoll_ctl(31, EPOLL_CTL_DEL, 30, {0, {u32=0, u64=0}}) = -1 ENOENT (No such file or directory) epoll_ctl(31, EPOLL_CTL_ADD, 30, {EPOLLOUT, {u32=359204480, u64=140724962657920}}) = 0 shutdown(29, 1 /* send */) = -1 ENOTCONN (Transport endpoint is not connected) epoll_ctl(31, EPOLL_CTL_DEL, 29, {0, {u32=0, u64=0}}) = 0 epoll_wait(31, {{EPOLLOUT|EPOLLHUP, {u32=359204480, u64=140724962657920}}}, 2, 60000) = 1 epoll_ctl(31, EPOLL_CTL_DEL, 29, {0, {u32=0, u64=0}}) = -1 ENOENT (No such file or directory) epoll_ctl(31, EPOLL_CTL_ADD, 29, {EPOLLOUT, {u32=359204392, u64=140724962657832}}) = 0 shutdown(30, 1 /* send */) The attached patch avoids the busy loop by setting "done", when apr_socket_shutdown returns with an error. Further more, when testing this patch by doing many concurrent rsync transfers, I noticed that some rsync clients still stall at some point (w/ and w/o SSL!). When these clients die, that's when the busy loop occurs. The test is very simple: # cat reproduce-endlesss-poll-loop.sh #!/bin/bash mkdir /testdst cd /testdst for i in {1..100}; do dd if=/dev/urandom of=$i bs=10M count=1 >/dev/null & done wait for i in {1..100}; do # w/ stunnel #RSYNC_PROXY=localhost:874 rsync -rcP rsync://localhost:873/testsrc/$i /testdst/$i & # no-ssl RSYNC_PROXY=192.168.122.11:80 rsync -rcP rsync://localhost:873/testsrc/$i /testdst/$i & done wait -- You are receiving this mail because: You are the assignee for the bug. --------------------------------------------------------------------- To unsubscribe, e-mail: bugs-unsubscr...@httpd.apache.org For additional commands, e-mail: bugs-h...@httpd.apache.org
