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### Description
Usage of `modparam("presence", "publ_cache", 2)` causes kamailio to crash shortly after starting up. This only happens when subscribe traffic is high (400 requests per second avg).
### Troubleshooting
#### Reproduction
The issue can be reproduced by starting up kamailio with the option above enabled and ~400 subscribe requests per second. The crash happens ~20 seconds after startup.
#### Debugging Data
<!-- If you got a core dump, use gdb to extract troubleshooting data - full backtrace, local variables and the list of the code at the issue location.
gdb /path/to/kamailio /path/to/corefile bt full info locals list
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``` (paste your debugging data here) ```
#### Log Messages
<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->
``` kernel: kamailio[25401]: segfault at 0 ip 00007f4a0a22d4d7 sp 00007fff6064a370 error 4 in presence.so[7f4a0a21e000+fe000] ```
#### SIP Traffic
<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->
``` (paste your sip traffic here) ```
### Possible Solutions
Running with the default
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
``` (paste your output here) ```
* **Operating System**:
<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `lsb_release -a` and `uname -a`) -->
``` Linux hostName 2.6.32-754.11.1.el6.x86_64 #1 SMP Tue Feb 26 15:38:56 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
version: kamailio 5.4.3 (x86_64/linux) e19ae3 flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: e19ae3 compiled on 18:24:43 Dec 14 2020 with gcc 4.4.7 ```
I realize this is an older version so if it's resolved in a newer one let me know.