Re: valgrind vs. shared typmod registry

On Sun, Sep 17, 2017 at 8:49 AM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> On Sun, Sep 17, 2017 at 7:42 AM, Thomas Munro
> <thomas.munro@enterprisedb.com> wrote:
>> On Sun, Sep 17, 2017 at 12:30 AM, Tomas Vondra
>> <tomas.vondra@2ndquadrant.com> wrote:
>>> I've been running some regression tests under valgrind, and it seems
>>> select_parallel triggers some uses of uninitialized values in dshash. If
>>> I'm reading the reports right, it complains about hashtable->size_log2
>>> being not being initialized in ensure_valid_bucket_pointers.
>>
>> Thanks.  Will investigate.
>
> Yeah, it's a bug, I simply failed to initialise it.
> ensure_valid_bucket_pointers() immediately fixes the problem (unless
> the uninitialised memory had an unlikely value), explaining why it
> works anyway.  I'm a bit tied up today but will test and post a patch
> tomorrow.

Here is a patch to fix that.

-- 
Thomas Munro
http://www.enterprisedb.com