I have a VM running CentOS 6. On this Linux box, I run 4 curl download concurrently.In some case, one of the curl download hangs. ps shows that curl process is still there. And netstat shows the connection's RECV_Q is very long:tcp   878104      0 10.161.238.20:46130         10.162.220.12:80            ESTABLISHED The curl version 7.38.0.Any idea? Why curl hangs? If increasing TCP buffer would help?
curl hangs during http download
curl;tcp