FAQ
The following bug has been logged online:

Bug reference: 6097
Logged by: Maxim Boguk
Email address: Maxim.Boguk@gmail.com
PostgreSQL version: 9.0 9.1beta
Operating system: Linux/Freebsd
Description: Server crash when enabling custom_variable_classes
Details:

I found crash bug in custom_variable_classes work.

Test case simple:
start server with empty custom_variable_classes

Then add to config file:

custom_variable_classes = 'something' # list of custom
variable class names
something.location = 'ru'

And then perform
select pg_reload_conf();

Ooops... you have no more working server (but client connections staying
alive).

Same crash with 9.0 and 9.1beta.

Adding just
custom_variable_classes = 'qqqq'
and pg_reload_conf() do not crash server.
But after I added qqqq.location = 'ru' to config and perform second
pg_reload_conf() server crashed again.

The same happens if server started with just custom_variable_classes =
'qqqq',
after I added qqqq.location = 'ru' and performend pg_reload_conf() server
crashed.

However with both option enabled server start and work without any issues.

PS: it is exeptionally strange no one happen to be hit by that problem
before.

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  • Tom Lane at Jul 8, 2011 at 2:54 pm

    "Maxim Boguk" <Maxim.Boguk@gmail.com> writes:
    Test case simple:
    start server with empty custom_variable_classes
    Then add to config file:
    custom_variable_classes = 'something' # list of custom
    variable class names
    something.location = 'ru'
    And then perform
    select pg_reload_conf();
    Ooops... you have no more working server (but client connections staying
    alive).
    Hmm ... it's not exactly a crash, but an intentional postmaster exit;
    the log shows

    LOG: received SIGHUP, reloading configuration files
    LOG: parameter "custom_variable_classes" changed to "something"
    FATAL: unrecognized configuration parameter "something.location"

    Nonetheless, it's clearly not the desired behavior :-(. Will look.

    regards, tom lane
  • Tom Lane at Jul 8, 2011 at 9:04 pm

    "Maxim Boguk" <Maxim.Boguk@gmail.com> writes:
    Description: Server crash when enabling custom_variable_classes
    Fixed, thanks for the report.

    regards, tom lane

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postedJul 8, '11 at 6:46a
activeJul 8, '11 at 9:04p
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