[iolib-devel] stuck sockets

[Attila Lendvai]

Stelian, i need your help.

our server went non-responsive and my investigation results in this:

all worker threads were waiting here:

 15: (IOLIB.STREAMS::%FILL-IBUF IOLIB.SOCKETS::SOCKET-READ-FN 15
#S(IOLIB.STREAMS::IOBUF :DATA #.(SB-SYS:INT-SAP #X00658620) :SIZE 4096
:START 0 :END 0))
 16: ((SB-GRAY:STREAM-READ-BYTE
(IOLIB.STREAMS:DUAL-CHANNEL-GRAY-STREAM)) #<active IPv6 stream socket
connected to ::ffff:81.183.137.134/1237 {100F6EEF71}>)

looking at netstat shows that there are exactly as many of these as
stuck threads:

tcp6       0      0 192.168.101.105:8080    81.183.137.134:1249
ESTABLISHED 1004       736341      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1265
ESTABLISHED 1004       736356      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1261
ESTABLISHED 1004       736352      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1237
ESTABLISHED 1004       736329      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1281
ESTABLISHED 1004       736999      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1257
ESTABLISHED 1004       736348      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1273
ESTABLISHED 1004       736363      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1242
ESTABLISHED 1004       736336      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1253
ESTABLISHED 1004       736344      -
tcp6       0      0 192.168.101.105:8080    81.183.137.134:1269
ESTABLISHED 1004       736360      -

do you think that this remote host is really keeping the connection open?

if so, do you think that it will help if i do this on the socket
returned by accept:

(setf (iolib:socket-option stream-socket :receive-timeout) 5)

thanks in advance,

-- 
 attila