Re: 9.4.1 segfault while creating hash index on temporary table

On 05/13/2015 08:09 AM, Tom Lane wrote:
> Artem Ignatyev <cryo28@gmail.com> writes:
>> I am seeing this bug on my CentOS 6.6 PostgreSQL 9.4.1 db server
>> (installed from rpms of yum.postgresql.org), as well as on postgresql
>> 9.4.1 from Ubuntu 15.04 repository on my  personal laptop.
>
> It's crashing because it's trying to acquire the content_lock on a
> local buffer, which of course doesn't have one.  This appears to have
> been broken in 8fc23a9e.  Oddly, HEAD does not have the problem because
> it looks like
>
>      if ((mode == RBM_ZERO_AND_LOCK || mode == RBM_ZERO_AND_CLEANUP_LOCK) &&
>          !isLocalBuf)
>      {
>          LWLockAcquire(bufHdr->content_lock, LW_EXCLUSIVE);
>      }
>
> but the back branches are missing the isLocalBuf bit.

Odd indeed. I must've added that at the last minute to the
master-version, but forgot the other branches.

Fixed now, thanks for the report and analysis.

- Heikki