[SVN-4643] svn: E175012: Connection timed out

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.9.4
• Component/s: libsvn_ra_serf

Environment

svn, version 1.9.4 (r1740329)
compiled Jul 14 2016, 17:02:22 on amd64-portbld-freebsd12.0

FreeBSD fbsd11-64 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r302998: Tue Jul 19 06:18:18 CEST 2016 root@fbsd11-64:/usr/obj/usr/src/sys/FBSD11 amd64

• Assignee: Unassigned
• Reporter: Thomas Schweikle
• Created: 20/Jul/16 19:17
• Updated: 20/Jul/16 19:17

Description

After checking out some files the client stops working, timing out after a while. Looking at connections you'll find some in state FIN_WAIT_2:
tcp4 0 0 fbsd11-64.25598 wfe0.ysv.freebsd.http SYN_SENT
tcp4 0 0 fbsd11-64.40258 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.62882 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.14105 proxy-lb-muc.8080 FIN_WAIT_2

every time you restart the client, another connection in state FIN_WAIT_2 is created. Doing it really fast you might have some tens of connections in state FIN_WAIT_2. These time out after the server terminates the connection because there is no traffic over this connection.
I can watch this behaviour with applications using serf. I do not notice this behaviour with applications using neon.
To checkout https://svn.freebsd.org/base/stable/11 using

svn co https://svn.freebsd.org/base/stable/11 /usr/src

Takes restarting the checkout about 50 times until it is complete. In the end there are around 20 ports in state FIN_WAIT_2:
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp4 0 0 fbsd11-64.41626 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.41625 wfe0.ysv.freebsd.http SYN_SENT
tcp4 0 0 fbsd11-64.41623 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.41622 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.41621 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.41618 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.41615 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.41612 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.28086 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.28083 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.28080 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.28079 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.28076 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.28075 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.28074 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.13607 proxy-lb-muc.8080 FIN_WAIT_2
tcp4 0 0 fbsd11-64.ssh nc403-muc.36996 ESTABLISHED
udp4 0 0 localhost.ntp .
udp6 0 0 fe80::1%lo0.ntp .
udp6 0 0 localhost.ntp .
udp4 0 0 fbsd11-64.ntp .
udp6 0 0 fe80::20c:29ff:f.ntp .