Re: R: R: R: R: BUG #6342: libpq blocks forever in "poll" function - Mailing list pgsql-bugs

"Andrea Grassi" <andreagrassi@sogeasoft.com> writes:
> This is the server side stack kept by gdb:
> [ server is waiting to receive something from client ]

> The netstat command on client and server connection has this output:
> The first line should be the server, the second the client.

> Proto Recv-Q Send-Q Local Address           Foreign Address         State
> PID/Program name
> tcp        0      0 127.0.0.1:5432          127.0.0.1:53129
> ESTABLISHED -
> tcp       48      0 127.0.0.1:53129         127.0.0.1:5432
> ESTABLISHED 29802/g_mrprun.e

Hrm.  What's with the 48 bytes in the client's receive queue?  Surely
the kernel should be reporting that the socket is read-ready, if it's
got some data.  I think you've found an obscure kernel bug ---- somehow
it's failing to wake the poll() caller.

            regards, tom lane