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

On 12/16/2011 03:45 PM, andreagrassi@sogeasoft.com wrote:
> The following bug has been logged on the website:
>
> Bug reference:      6342
> Logged by:          Andrea Grassi
> Email address:      andreagrassi@sogeasoft.com
> PostgreSQL version: 8.4.8
> Operating system:   SUSE SLES 10 SP4 64 BIT
> Description:
>
> Hi,
> I have a big and strange problem. Sometimes, libpq remains blocked in “poll”
> function even if the server has already answered to the query. If I attach
> to the process using kdbg I found this stack:
>
> __kernel_vsyscall()
> poll()                          from /lib/libc.so.6
Given all you described (thanks for all the detail!) then if client and
server are on different hosts this could easily be a NIC driver or HW
issue. It'd be interesting to see the output of:

ps -C testprogramname -o wchan:80=

--
Craig Ringer