[sr-dev] [kamailio/kamailio] Segfault start Kamailio 5.5 (#2736)

[sergey-safarov]

Minimal config
```
loadmodule "ipops.so"
loadmodule "pv.so"
loadmodule "textops.so"
loadmodule "textopsx.so"

pv_buffer_slots = 30

#!substdef "!MAJOR!$(version(num){re.subst,/^(([^\.])*\.([^\.])*)\..*/\1/})!g"
#!substdef "!MY_HOSTNAME!$HN(f)!g"
#!substdef "!MY_WEBSOCKET_DOMAIN!$HN(d)!g"
#!substdef "!KAMAILIO_DBMS!$def(KZ_DB_MODULE)!g"

#!substdef "!MY_IP_ADDRESS!$HN(i)!g"
#!substdef "!SANITY_SUBST_CACHE_PERIOD!$def(SANITY_CACHE_PERIOD)!g"

#!substdef "!KZQ_CHECK_MEDIA_SERVER_INSERT!insert into dispatcher (setid, destination) select \$var(SetId), \"\$var(MediaUrl)\" from DUAL where not exists(select * from dispatcher where destination = \"\$var(MediaUrl)\")!g"
#!substdef "!KZQ_COUNT_SUBSCRIBERS!select event, (select count(*) from active_watchers b where presentity_uri = \"\$var(presentity)\" and b.event = a.event) count from event_list a!g"
#!substdef "!KZQ_HANDLE_NEW_SUBSCRIBE_DELETE1!delete from active_watchers where callid = \"\$ci\"!g"
#!substdef "!KZQ_HANDLE_NEW_SUBSCRIBE_DELETE2!delete from active_watchers where watcher_username=\"\$fU\" and presentity_uri=\"\$var(presentity_uri)\" and to_user=\"\$tU\" and watcher_domain=\"\$fd\" and event=\"\$hdr(Event)\"!g"
#!substdef "!KZQ_RESET_PUBLISHER_UPDATE!update active_watchers set expires = \$TS where id in (select * from (select b.id from presentity a inner join active_watchers b on a.username = b.to_user and a.domain = b.to_domain and a.event = b.event where a.sender = \"\$var(MediaUrl)\") AS presentity_temp)!g"
#!substdef "!KZQ_PRESENCE_SEARCH_DETAIL!select * from active_watchers_log where presentity_uri = \"\$var(presentity_uri)\"!g"
#!substdef "!KZQ_PRESENCE_SEARCH_SUMMARY!select * from active_watchers where watcher_domain = \"\$var(Domain)\"!g"
#!substdef "!KZQ_PRESENCE_RESET!delete from presentity where sender = \"\$var(MediaUrl)\"!g"

listen=tcp:127.0.0.1:5090

####### Routing Logic ########
route
{
   $avp(device_id) = $hdr(X-Device-Id);
   $avp(account_db) = $hdr(X-Account-Db);
   $var(text) = $hdr(Contact);
   $var(expires) = $hdr(Expires);
   $var(header) = $hdr(X-KAZOO-Respond-With);
   $var(xxxx) = $hdr(To);
   $var(rr_base) = $hdr(Record-Route);
   $xavp(hf=>X-AUTH-IP) = $hdr(X-AUTH-IP);
   $xavp(hf=>X-AUTH-PORT) = $hdr(X-AUTH-PORT);
   $var(LocalRoute) = $hdr(X-TM-Local);
   $ru = $hdr(X-URN-Service);
   append_hf_value("Call-Info", "$(hdr(X-NenaCallId)[0])");

   if ($hdr(X-KAZOO-INVITE-FORMAT) == "route") {
       $var(referred_by) = $hdr(Referred-By);
   }

   if ($hdr(X-Redirect-Server) != $null) {
      $avp(destination_uri) = $hdr(X-KAZOO-AOR);
   }

}
```

If `pv_buffer_slots` has value 18-24, 26, 27, 29, 30 then core created.
Tested 0e51ce1075f206a4441333f72c69fcc56f8d6855

Also important, `-m` and `-M` Kamailio arguments affect how long Kamailio trying to start.
But no matter how much memory provided, Kamailio will fail.


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