Re: [Trac] Long timeout when modifying a ticket

'Jean-Marc Lasgouttes' via Trac Users wrote on 03.04.2026 at 13:20:
> Le 03/04/2026 =C3=A0 12:17, Clemens Feige a =C3=A9crit=C2=A0:
>>
>> 'Jean-Marc Lasgouttes' via Trac Users wrote on 03.03.2026 at 16:38:
>>> Daer Trac users,
>>>
>>> We have a trac installation that worked well until fairly recently.=20
>>> Now, every time one tries to modify a ticket, nothing happens for a=20
>>> minute or so, and then the modification is done.
>>>
>>> This is not a matter of load on the server, it looks more like a=20
>>> timeout somewhere.
>>>
>>> I see nothing of interest in trac.log. Have you already experienced=20
>>> such a situation? Where should I look?>
>> In our TRAC (on Linux) we can sometimes (not always) see long delays=20
>> on ticket creation / modification which seem to be related to TRAC=20
>> notification via e-mail.
>>
>> Check if you have enabled notification via e-mail or "CC" field in=20
>> your ticket.
>=20
> Thank you for your answer that makes me follow up on this subject as I=20
> should have done earlier. It turned out that the issue was that
>=20
> It seems the "lock" was a mailing problem, i.e., for whatever reason
> smtp.osuosl.org started to be resolved in ipv6 way, that freezes
> for 10=C2=A0mins and then switches back to ipv4.
>=20
> We switched the glibc resolver to prefer IPv4 over IPv6 for
> all applications. Mail seems to work fine again and trac is back.
>=20
> Sorry for not letting you know earlier. Thanks to Jun for suggesting=20
> creating a fill debug log, that was useful.
>=20
> JMarc


So we can conclude that TRAC may "hang" or appear "locked" for a longer=20
time period (minutes) in case of certain e-mail issues when attempting=20
to send ticket notifications via mail.

Of course the mail problems are not the fault of TRAC. But I would=20
expect that the TRAC server should not be blocked in such cases.

I am not a TRAC developer and cannot judge if this is worth a ticket.=20
Also I do not know how to reproduce.

Clemens


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