[pgpool-general: 48] Re: [Pgpool-general] seemingly hung pgpool process consuming 100% CPU

Tatsuo Ishii ishii at postgresql.org
Wed Dec 7 11:49:15 JST 2011


Can you tell me if you are enabling SSL between frontend and pgpool
AND/OR pgpool and PostgreSQL?
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

> Lonni,
> 
> First of all, pgpool-general at pgfoundry has moved to  pgpool-general at pgpool.net.
> Please subscribe here:
> 
> http://www.pgpool.net/mailman/listinfo/pgpool-general
> 
> From: Lonni J Friedman <netllama at gmail.com>
> Subject: Re: [Pgpool-general] seemingly hung pgpool process consuming 100% CPU
> Date: Tue, 6 Dec 2011 16:23:41 -0800
> Message-ID: <CAP=oouHQACD6ELcHOZz+3Oz8NkbbgjK3gSRbcbHrPKoi_DRP8g at mail.gmail.com>
> 
>> On Wed, Nov 23, 2011 at 10:51 PM, Tatsuo Ishii <ishii at sraoss.co.jp> wrote:
>>>> On Wed, Nov 23, 2011 at 10:42 PM, Tatsuo Ishii <ishii at sraoss.co.jp> wrote:
>>>>>> Not wanting to be impatient, but I'm very concerned about this
>>>>>> problem, since its impossible to predict when it will occur.  Is there
>>>>>> additional information that I can provide to investigate this further?
>>>>>
>>>>> I really need to know where pgpool is looping.
>>>>
>>>> OK, how can I capture that information?
>>>
>>> You already attached to the pgpool process. So just type "n" (for
>>> "next") will tell you next line to execute. If pgpool really loops,
>>> "n" should show the same line after some repeating "n".
>> 
>> OK, this reproduced again.  Here's the output:
>> #######
>> (gdb) bt
>> #0  0x0000000000419305 in pool_process_query (frontend=0x413e1f0,
>> backend=0x24d3520, reset_request=<value optimized out>) at
>> pool_process_query.c:111
>> #1  0x000000000040ae42 in do_child (unix_fd=3, inet_fd=<value
>> optimized out>) at child.c:354
>> #2  0x00000000004054c5 in fork_a_child (unix_fd=3, inet_fd=4, id=126)
>> at main.c:1072
>> #3  0x0000000000407b1c in main (argc=<value optimized out>,
>> argv=<value optimized out>) at main.c:549
>> (gdb) cont
>> Continuing.
>> ^C
>> Program received signal SIGINT, Interrupt.
>> pool_ssl_pending (cp=0x413e1f0) at pool_ssl.c:247
>> 247     {
>> (gdb) n
>> 248             if (cp->ssl_active > 0 && SSL_pending(cp->ssl) > 0)
>> (gdb) n
>> 251     }
>> (gdb) n
>> is_cache_empty (frontend=0x413e1f0, backend=0x24d3520) at
>> pool_process_query.c:3232
>> 3232            if (!pool_read_buffer_is_empty(frontend))
>> (gdb) n
>> 3235            for (i=0;i<NUM_BACKENDS;i++)
>> (gdb) n
>> 3237                    if (!VALID_BACKEND(i))
>> (gdb) n
>> 3244                    if (pool_ssl_pending(CONNECTION(backend, i)))
>> (gdb) n
>> 3247                    if (CONNECTION(backend, i)->len > 0)
>> (gdb) n
>> 3237                    if (!VALID_BACKEND(i))
>> (gdb) n
>> 3244                    if (pool_ssl_pending(CONNECTION(backend, i)))
>> (gdb) n
>> 3247                    if (CONNECTION(backend, i)->len > 0)
>> (gdb) n
>> 3252    }
>> (gdb) n
>> 3235            for (i=0;i<NUM_BACKENDS;i++)
>> (gdb) n
>> 3252    }
>> (gdb) n
>> pool_process_query (frontend=0x413e1f0, backend=0x24d3520,
>> reset_request=<value optimized out>) at pool_process_query.c:361
>> 361                             if
>> (!pool_read_buffer_is_empty(frontend) && !pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 388                     if (got_sighup)
>> (gdb) n
>> 111             state = 0;
>> (gdb) n
>> 116                     if (state == 0 && reset_request)
>> (gdb) n
>> 159                     check_stop_request();
>> (gdb) n
>> 165                     if (*InRecovery > 0 &&
>> pool_config->client_idle_limit_in_recovery == -1)
>> (gdb) n
>> 179                     if (is_cache_empty(frontend, backend) &&
>> !pool_is_query_in_progress())
>> (gdb) n
>> 361                             if
>> (!pool_read_buffer_is_empty(frontend) && !pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 388                     if (got_sighup)
>> (gdb) n
>> 111             state = 0;
>> (gdb) n
>> 116                     if (state == 0 && reset_request)
>> (gdb) n
>> 159                     check_stop_request();
>> (gdb) n
>> 165                     if (*InRecovery > 0 &&
>> pool_config->client_idle_limit_in_recovery == -1)
>> (gdb) n
>> 179                     if (is_cache_empty(frontend, backend) &&
>> !pool_is_query_in_progress())
>> (gdb) n
>> 361                             if
>> (!pool_read_buffer_is_empty(frontend) && !pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 388                     if (got_sighup)
>> (gdb) n
>> 111             state = 0;
>> (gdb) n
>> 116                     if (state == 0 && reset_request)
>> (gdb) n
>> 159                     check_stop_request();
>> (gdb) n
>> 165                     if (*InRecovery > 0 &&
>> pool_config->client_idle_limit_in_recovery == -1)
>> (gdb) n
>> 179                     if (is_cache_empty(frontend, backend) &&
>> !pool_is_query_in_progress())
>> (gdb) n
>> 361                             if
>> (!pool_read_buffer_is_empty(frontend) && !pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 388                     if (got_sighup)
>> (gdb) n
>> 111             state = 0;
>> (gdb) n
>> 116                     if (state == 0 && reset_request)
>> (gdb) n
>> 159                     check_stop_request();
>> (gdb) n
>> 165                     if (*InRecovery > 0 &&
>> pool_config->client_idle_limit_in_recovery == -1)
>> (gdb) n
>> 179                     if (is_cache_empty(frontend, backend) &&
>> !pool_is_query_in_progress())
>> (gdb) n
>> 361                             if
>> (!pool_read_buffer_is_empty(frontend) && !pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) n
>> 379                             if
>> (!pool_read_buffer_is_empty(MASTER(backend)) ||
>> pool_is_query_in_progress())
>> (gdb) bt
>> #0  pool_process_query (frontend=0x413e1f0, backend=0x24d3520,
>> reset_request=<value optimized out>) at pool_process_query.c:379
>> #1  0x000000000040ae42 in do_child (unix_fd=3, inet_fd=<value
>> optimized out>) at child.c:354
>> #2  0x00000000004054c5 in fork_a_child (unix_fd=3, inet_fd=4, id=126)
>> at main.c:1072
>> #3  0x0000000000407b1c in main (argc=<value optimized out>,
>> argv=<value optimized out>) at main.c:549
>> (gdb) q
>> A debugging session is active.
>> 
>>         Inferior 1 [process 22143] will be detached.
>> #######
>> 
>> 
>> Does this clarify where the problem exists?  If so, is it fixed in 3.1.1?
>> 
>> thanks
> 
> Thanks. I will look into this. I'm sure this is not fixed in 3.1.1
> since the issue above has not been addressed yet.
> --
> Tatsuo Ishii
> SRA OSS, Inc. Japan
> English: http://www.sraoss.co.jp/index_en.php
> Japanese: http://www.sraoss.co.jp
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> pgpool-general mailing list
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