[nsd-users] Repeated crashes of NSD, without a clear explanation

[Stephane Bortzmeyer]

On Tue, Jan 07, 2020 at 09:11:56AM +0300,
 Anand Buddhdev via nsd-users <nsd-users at lists.nlnetlabs.nl> wrote 
 a message of 36 lines which said:

> This suggests that an incoming XFR is triggering a bug. Have you saved
> the contents of the nsd-xfr-1974 directory? If not, perhaps you can save
> it the next time it happens. This may help the developers in figuring
> out what causes the crash.

Apparently, it was a lack of memory:

[8374219.385014] Out of memory: Kill process 10677 (nsd) score 66 or sacrifice child
[8374219.385758] Killed process 10678 (nsd) total-vm:37552kB, anon-rss:676kB, file-rss:0kB, shmem-rss:27344kB
[8374219.386779] oom_reaper: reaped process 10678 (nsd), now anon-rss:0kB, file-rss:0kB, shmem-rss:27344kB

> Finally, the database mode is no longer recommended. Could you try
> running your instance of NSD with:
> 
> database: ""

Currently under test and no problem yet (anyway, I'll add RAM).