[PATCH] Cache messaging dgm connections

[Ralph Böhme]

Hi Garming,

On Thu, Sep 15, 2016 at 11:36:55AM +1200, Garming Sam wrote:
> Seen some flapping tests in autobuild, and it looks like it's related to
> the dgram changes. I originally thought it was another replication
> issue, because of an IO timeout, but apparently not.
> 
> I'm not sure if it's the callers fault here, but I thought it would be
> easier if you could take a look and give some advice.

sorry for this.

> https://git.samba.org/autobuild.flakey.sn-devel-144/2016-09-14-1112/samba.stderr

The problem is here:

#29 0x00002af8894bdd54 in dns_notify_dnssrv_done (req=0x2af892d1f170) at ../source4/dsdb/samdb/ldb_modules/dns_notify.c:72

This calls talloc_free() on an imessaging context and the crash is
similar to what I was trying to fix in 02bb6b2: at the time a tevent
timer destructor is called in the course of the talloc_free() on the
imessaging context

#9  0x00002af88224ba1d in tevent_common_timed_destructor (te=0x2af88c8a4b70) at ../lib/tevent/tevent_timed.c:140

some required object is already freed. Still trying to understand
which object, I don't think it's the tevent context like in 02bb6b2
but it could be the same problem.

Still looking into it...

Cheerio!
-slow