On 9/13/21 8:19 AM, Jaime Casanova wrote:
> On Sun, Sep 12, 2021 at 08:23:44PM -0500, Justin Pryzby wrote:
>> On Sun, Sep 12, 2021 at 07:44:47PM -0500, Jaime Casanova wrote:
>>> Hi Tomas,
>>>
>>> Just noted that this query crash the server. Execute it in the
>>> regression database:
>>
>> If I'm not wrong, this is the crash fixed by e1fbe1181 in April.
>>
>> Could you check what HEAD your server is compiled from ?
>>
>
> That was with yesterday's head but trying with today's head this
> same update works fine.
>
> Maybe there is something else happening here, will try to investigate
> tomorrow.
>
Per the backtrace the value is very close to 0
delta = -1.1641532182693481e-08
so I suspect this might be a rounding error when calculating the delta
as a difference between two inet values. That's harmless in practice,
but it may trigger the assert.
I wonder if the delta should be calculated differently. Currently we
calculate it "byte by byte" adding up the smaller differences. But that
has this rounding issue.
regards
--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
