Re: BUG #7676: pgSocketCheck dosen`t return

On Monday, November 19, 2012 11:31 AM yongchao(dot)xu(at)newtouch(dot)cn wrote:
> The following bug has been logged on the website:
>
> Bug reference: 7676
> Logged by: yonchao
> Email address: yongchao(dot)xu(at)newtouch(dot)cn
> PostgreSQL version: 8.4.6
> Operating system: CentOS 5.5（64bit）
> Description:
>
> I have this problem today: one thread of our application hung, and
> we found the thread waiting for the result of poll() function. poll()
> was called by pgSocketCheck(). So is it a bug of pg? I found the bug
> report from
> website(http://archives.postgresql.org/pgsql-bugs/2008-02/msg00260.php),
> and want to know:
>
> 1. Has this problem been solved in the newest version?
> 2. If not, what shall I do to avoid this problem?
>
> Thanks a lot!
>
> PS:
> gdb info:
> (gdb) bt
> #0 0x00d31402 in __kernel_vsyscall ()
> #1 0x003d3dc3 in poll () from /lib/i686/nosegneg/libc.so.6
> #2 0x0013de5d in pqSocketCheck () from /usr/local/pgsql/lib/libpq.so.5
> #3 0x0013df8d in pqWaitTimed () from /usr/local/pgsql/lib/libpq.so.5
> #4 0x0013e003 in pqWait () from /usr/local/pgsql/lib/libpq.so.5
> #5 0x0013d792 in PQgetResult () from /usr/local/pgsql/lib/libpq.so.5

I have also observed similar problem in some of tests, but it appears to be hung due to network break and it came out after 15-20 minutes.

With Regards,
Amit Kapila.