Re: BUG #15446: Crash on ALTER TABLE

Hi,

On 2018-10-19 23:20:10 +0000, PG Bug reporting form wrote:
> The following bug has been logged on the website:
>
> Bug reference: 15446
> Logged by: Dmitry Molotkov
> Email address: aldarund(at)gmail(dot)com
> PostgreSQL version: 11.0
> Operating system: docker
> Description:
>
> postgres via docker.
> latest tag dont work.
>
> 2018-10-19 23:17:53.903 UTC [1] LOG: server process (PID 69) was terminated
> by signal 11: Segmentation fault
> 2018-10-19 23:17:53.903 UTC [1] DETAIL: Failed process was running: ALTER
> TABLE "admin_interface_theme" ALTER COLUMN
> "related_modal_background_opacity" TYPE varchar(5) USING
> "related_modal_background_opacity"::varchar(5)

Unfortunately this is not enough information to reproduce the
problem. It'd be very helpful if you could provide a reproducible set of
commands that trigger the crash. Alternatively, should that prove hard,
the very least we're going to need the table definition of that
admin_interface_theme table, so we can attempt to reproduce the issue
ourselves.

Greetings,

Andres Freund