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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are using Opensips 2.4.6(apt repo) on Debian stretch<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">opensips -V<o:p></o:p></p>
<p class="MsoNormal">version: opensips 2.4.6 (x86_64/linux)<o:p></o:p></p>
<p class="MsoNormal">flags: STATS: On, DISABLE_NAGLE, USE_MCAST, SHM_MMAP, PKG_MALLOC, F_MALLOC, FAST_LOCK-ADAPTIVE_WAIT<o:p></o:p></p>
<p class="MsoNormal">ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535<o:p></o:p></p>
<p class="MsoNormal">poll method support: poll, epoll, sigio_rt, select.<o:p></o:p></p>
<p class="MsoNormal">main.c compiled on with gcc 6.3.0<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We started to use dns_cache module recently.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However, after we add the module, opensips crashes when it stores a particular dns_cache and we noticed below error<o:p></o:p></p>
<p class="MsoNormal">Dec 4 03:53:17 /usr/sbin/opensips[10788]: INFO:dns_cache:put_dnscache_value: putting key [dnscache_xxxx_naptr] with value [|] ttl = 7200<o:p></o:p></p>
<p class="MsoNormal">Dec 4 03:53:17 /usr/sbin/opensips[10788]: INFO:dns_cache:put_dnscache_value: putting key [dnscache__sip._udp.xxxx_srv] with value [|] ttl = 7200<o:p></o:p></p>
<p class="MsoNormal">Dec 4 03:53:17 /usr/sbin/opensips[10788]: INFO:dns_cache:put_dnscache_value: putting key [dnscache_xxxx_aaaa] with value [|] ttl = 7200<o:p></o:p></p>
<p class="MsoNormal">Dec 4 03:53:17 /usr/sbin/opensips[10788]: INFO:dns_cache:put_dnscache_value: putting key [dnscache_xxxx_a] with value [#002] ttl = 1769<o:p></o:p></p>
<p class="MsoNormal">Dec 4 03:53:17 /usr/sbin/opensips[10788]: INFO:dns_cache:put_dnscache_value: putting key [dnscache_yyyy_naptr] with value [|] ttl = 7200<o:p></o:p></p>
<p class="MsoNormal">Dec 4 03:53:17 /usr/sbin/opensips[10788]: INFO:dns_cache:put_dnscache_value: putting key [dnscache__sip._udp.yyyy_srv] with value [|] ttl = 7200<o:p></o:p></p>
<p class="MsoNormal">Dec 4 03:53:17 /usr/sbin/opensips[10788]: INFO:dns_cache:put_dnscache_value: putting key [dnscache_yyyy_aaaa] with value [|] ttl = 7200<o:p></o:p></p>
<p class="MsoNormal">Dec 4 03:53:17 /usr/sbin/opensips[10788]: INFO:dns_cache:put_dnscache_value: putting key [dnscache_yyyy_a] with value [#002] ttl = 60<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Dec 4 03:53:24 /usr/sbin/opensips[10789]: INFO:dns_cache:put_dnscache_value: putting key [dnscache_[CNAME_hostname]_aaaa] with value [#012] ttl = 20062<br>
Dec 4 03:53:24 /usr/sbin/opensips[10789]: CRITICAL:core:sig_usr: segfault in process pid: 10789, id: 6<br>
Dec 4 03:53:24 /usr/sbin/opensips[10854]: CRITICAL:core:handle_worker: dead child 6 (EOF received), pid 10789<br>
Dec 4 03:53:24 /usr/sbin/opensips[10773]: INFO:core:handle_sigs: child process 10789 exited by a signal 11</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To replicate:<o:p></o:p></p>
<p class="MsoNormal">======================<o:p></o:p></p>
<p class="MsoNormal">dns_try_ipv6=yes<o:p></o:p></p>
<p class="MsoNormal">…<o:p></o:p></p>
<p class="MsoNormal">loadmodule "cachedb_local.so"<o:p></o:p></p>
<p class="MsoNormal">loadmodule "dns_cache.so"<o:p></o:p></p>
<p class="MsoNormal">…<o:p></o:p></p>
<p class="MsoNormal">modparam("dns_cache", "cachedb_url","local://")<o:p></o:p></p>
<p class="MsoNormal">modparam("dns_cache", "blacklist_timeout",7200)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Create a hostname with AAAA record points to a CNAME without any records (E.g
<a href="http://www.example.com">www.example.com</a> 60 IN CNAME <a href="http://www.example.net">
www.example.net</a>., but do not give any AAAA record to <a href="http://www.example.net">
www.example.net</a>)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">modparam("proto_hep", "hep_id", "[hep_dst] <a href="http://www.example.com;transport=udp;version=3">
www.example.com;transport=udp;version=3</a>") #we are using the hostname here in proto_hep, I think it can be triggered anywhere.<o:p></o:p></p>
<p class="MsoNormal">======================<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">From the log, I believe if the dns query fail, it will store it for {blacklist_timeout} seconds.<o:p></o:p></p>
<p class="MsoNormal">However, in my case, it can get a CNAME answer, but there is no actual IPv6 IP associate with it, and it is where opensips crash happens. The ttl = 20062 also looks weird in the log, because I set it up for 60 only.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We also tried to use the cachedb_memcached by setting up a memcache server, same crash. However, when we tried to use the same settings on a server without this particular CNAME record, then the issue is gone.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-family:Engrez">--<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:Engrez">Regards,<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:Engrez">William Jin</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:Engrez;color:#7F7F7F"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Tahoma",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><img border="0" width="91" height="74" style="width:.9479in;height:.7708in" id="Picture_x0020_1" src="cid:image001.png@01D5AA91.B929EC90" alt="cid:image001.png@01CF28AB.CA19A270"><span lang="EN-US" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:Engrez;color:#7F7F7F">Exetel System Adminitrator | Exetel PTY LTD<o:p></o:p></span></p>
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