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Re: BUG #6342: libpq blocks forever in "poll" function

From: Craig Ringer <ringerc(at)ringerc(dot)id(dot)au>
To: andreagrassi(at)sogeasoft(dot)com
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #6342: libpq blocks forever in "poll" function
Date: 2011-12-16 08:23:34
Message-ID: 4EEB0006.7080205@ringerc.id.au (view raw or flat)
Thread:
Lists: pgsql-bugs
On 12/16/2011 03:45 PM, andreagrassi(at)sogeasoft(dot)com wrote:
> The following bug has been logged on the website:
>
> Bug reference:      6342
> Logged by:          Andrea Grassi
> Email address:      andreagrassi(at)sogeasoft(dot)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

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Next:From: Craig RingerDate: 2011-12-16 08:24:36
Subject: Re: BUG #6342: libpq blocks forever in "poll" function
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