Re: dns_hash_put(): unlinked item errors

> On Jun 10, 2025, at 4:00 PM, JR Richardson via sr-users <[email protected]> wrote:
> 
> Hey Folks,
> 
> Running kamailio 5.8.4, haven't needed or used DNS functions
> previously but recently completed clearip integration, which requires
> sip request to use URL instead of IP and resolve where to send
> request. Within hours of adding URL lookups I started getting dns_hash
> unlinked errors. I correlated the log errors to when the URL changed
> IP. I assume the caching is working because kamailio sends to the same
> IP for a few minutes, then switches IP, sends to new IP for a few
> minutes, then switches IP again and this activity continues.
> 
> Here are some log errors:
> 
> switch IP
> Jun 10 14:14:17 siprouter1-pve186 /usr/local/sbin/kamailio[8111]:
> WARNING: <core> [core/dns_cache.c:170]: dns_hash_put(): unlinked item
> 0x7fa0f9b9fcc0
> Jun 10 14:14:19 siprouter1-pve186 /usr/local/sbin/kamailio[8122]:
> WARNING: <core> [core/dns_cache.c:185]: dns_hash_put_shm_unsafe():
> unlinked item 0x7fa0f9b9fcc0
> 
> switch IP
> Jun 10 14:15:00 siprouter1-pve186 /usr/local/sbin/kamailio[8111]:
> WARNING: <core> [core/dns_cache.c:170]: dns_hash_put(): unlinked item
> 0x7fa0f9b9ee00
> Jun 10 14:15:03 siprouter1-pve186 /usr/local/sbin/kamailio[8122]:
> WARNING: <core> [core/dns_cache.c:185]: dns_hash_put_shm_unsafe():
> unlinked item 0x7fa0f9b9ee00
> 
> switch IP
> Jun 10 14:15:33 siprouter1-pve186 /usr/local/sbin/kamailio[8110]:
> WARNING: <core> [core/dns_cache.c:170]: dns_hash_put(): unlinked item
> 0x7fa0f9b8e640
> Jun 10 14:15:33 siprouter1-pve186 /usr/local/sbin/kamailio[8122]:
> WARNING: <core> [core/dns_cache.c:185]: dns_hash_put_shm_unsafe():
> unlinked item 0x7fa0f9b8e640
> 
> switch IP
> Jun 10 14:20:37 siprouter1-pve186 /usr/local/sbin/kamailio[8109]:
> WARNING: <core> [core/dns_cache.c:170]: dns_hash_put(): unlinked item
> 0x7fa0f9b3eb60
> 
> switch IP
> Jun 10 14:21:12 siprouter1-pve186 /usr/local/sbin/kamailio[8117]:
> WARNING: <core> [core/dns_cache.c:170]: dns_hash_put(): unlinked item
> 0x7fa0f9b830f0
> Jun 10 14:21:23 siprouter1-pve186 /usr/local/sbin/kamailio[8122]:
> WARNING: <core> [core/dns_cache.c:185]: dns_hash_put_shm_unsafe():
> unlinked item 0x7fa0f9b830f0
> 
> Here are my DNS config parameters, nothing I've changed made any
> difference. And as far as I can tell I'm not dropping any clearip
> queries.
> dns=no
> rev_dns=no
> use_dns_failover=on
> dns_try_ipv6=no
> 
> I did find a patch update for this error back from 2023 and the patch
> is in my /src/core/dns_cache.c as expected but still getting errors.
> 
> Any guidance in clearing this error?
> 
> Thanks.
> JR


Not an answer to your question, but to use failover, use_dns_cache (I believe) needs to be on.

https://github.com/kamailio/kamailio/blob/master/doc/tutorials/dns.txt

Fred Posner
Tel: +1 (352) 664-3733
Alt: +1 (224) 334-3733

Contact info at https://fredp.xyz


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