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### Description I tried to update to a new version of kamailio and it didn't start with the old configuration file, I found out that the regex module is responsible. Log after start: ` 0(713737) INFO: regex [regex_mod.c:417]: load_pcres(): num groups = 1 0(713737) INFO: regex [regex_mod.c:419]: load_pcres(): <group[0]>((^[1-9]\d{5}$)|(^ukrb[12]$)) </group[0]> (size = 29) 0(713735) ERROR: <core> [core/daemonize.c:302]: daemonize(): Main process exited before writing to pipe` <!-- Explain what you did, what you expected to happen, and what actually happened. -->

### Troubleshooting

#### Reproduction

<!-- If the issue can be reproduced, describe how it can be done. --> grep regex /usr/local/etc/kamailio/kamailio.cfg loadmodule "regex.so" modparam("regex", "file", "/usr/local/etc/kamailio/regex_groups")

cat /usr/local/etc/kamailio/regex_groups [0] #cislo linky (^[1-9]\d{5}$) (^ukrb[12]$)

#### 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

If you are familiar with gdb, feel free to attach more of what you consider to be relevant. -->

``` gdb /usr/local/sbin/kamailio /core GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: https://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/.

For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/local/sbin/kamailio...

warning: Can't open file /dev/zero (deleted) during file-backed mapping note processing [New LWP 713740]

warning: Section `.reg-xstate/713740' in core file too small. [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `/usr/local/sbin/kamailio -S -P /run/kamailio/kamailio.pid -f /usr/local/etc/kam'. Program terminated with signal SIGSEGV, Segmentation fault.

warning: Section `.reg-xstate/713740' in core file too small. #0 load_pcres (action=0) at regex_mod.c:466 466 *pcres = *pcres_tmp; (gdb) bt full #0 load_pcres (action=0) at regex_mod.c:466 i = 1 j = 32 f = 0x55c5775ea6b0 line = '\000' <repeats 499 times> patterns = 0x7f7e7ad3a230 pcre_error_num = 100 pcre_error = '\000' <repeats 16 times>, "\277Fou\305U\000\000\000\000\000\000m\000\000\000(Hou\305U\000\000\332Gou\305U\000\000\220\000\000\000\000\000\000\000\020\240\303z~\177\000\000 \274$u\305U\000\000\037\000\000\000\004\000\000\000\001\000\000\000%\000\000\000\n\344\n\000\000\000\000\000 \274$u\305U\000\000\000\000\000\000\000\000\000\000\n\344\n\000\000\000\000\000\360\212\355\255\374\177\000" pcre_erroffset = 0 num_pcres_tmp = 1 pcres_tmp = 0x7f7e7ad62c00 llen = 19 __func__ = "load_pcres" #1 0x00007f7e79f62c92 in mod_init () at regex_mod.c:245 __func__ = "mod_init" #2 0x000055c5754a99f7 in init_mod (m=0x7f7e7adeb1f0) at core/sr_module.c:1036 ret = -2097389668 __func__ = "init_mod" #3 0x000055c5754a9687 in init_mod (m=0x7f7e7adeb6c0) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #4 0x000055c5754a9687 in init_mod (m=0x7f7e7adebda0) at core/sr_module.c:1031 ret = -2097386271 __func__ = "init_mod" #5 0x000055c5754a9687 in init_mod (m=0x7f7e7adec3b0) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #6 0x000055c5754a9687 in init_mod (m=0x7f7e7adec910) at core/sr_module.c:1031 ret = -1376937648 __func__ = "init_mod" #7 0x000055c5754a9687 in init_mod (m=0x7f7e7adece70) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #8 0x000055c5754a9687 in init_mod (m=0x7f7e7aded520) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #9 0x000055c5754a9687 in init_mod (m=0x7f7e7adedc10) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #10 0x000055c5754a9687 in init_mod (m=0x7f7e7adee1f0) at core/sr_module.c:1031 ret = -1376937902 __func__ = "init_mod" #11 0x000055c5754a9687 in init_mod (m=0x7f7e7adeeaf0) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #12 0x000055c5754a9687 in init_mod (m=0x7f7e7adef4d0) at core/sr_module.c:1031 ret = 16 __func__ = "init_mod" #13 0x000055c5754a9687 in init_mod (m=0x7f7e7adef8e0) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #14 0x000055c5754a9687 in init_mod (m=0x7f7e7adefdd0) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #15 0x000055c5754a9687 in init_mod (m=0x7f7e7adf3320) at core/sr_module.c:1031 ret = 2053729903 __func__ = "init_mod" #16 0x000055c5754a9687 in init_mod (m=0x7f7e7adf3770) at core/sr_module.c:1031 ret = -1 __func__ = "init_mod" #17 0x000055c5754a9687 in init_mod (m=0x7f7e7adf3ba0) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #18 0x000055c5754a9687 in init_mod (m=0x7f7e7adf4140) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #19 0x000055c5754a9687 in init_mod (m=0x7f7e7adf4550) at core/sr_module.c:1031 ret = 0 __func__ = "init_mod" #20 0x000055c5754a9687 in init_mod (m=0x7f7e7adf6140) at core/sr_module.c:1031 ret = 713738 __func__ = "init_mod" #21 0x000055c5754a9dc4 in init_modules () at core/sr_module.c:1067 t = 0xae40a i = -1 __func__ = "init_modules" #22 0x000055c57526927c in main (argc=12, argv=0x7ffcaded9fd8) at main.c:3202 cfg_stream = 0x55c57746a2a0 c = -1 r = 0 tmp = 0x7ffcadedae88 "" tmp_len = 832 port = 5060 proto = 0 aproto = 0 ahost = 0x0 aport = 0 options = 0x55c5756b8368 ":f:cm:M:dVIhEeb:B:l:L:n:vKrRDTN:W:w:t:u:g:P:G:SQ:O:a:A:x:X:Y:" ret = -1 seed = 4165046025 rfd = 4 debug_save = 0 debug_flag = 0 dont_fork_cnt = 0 n_lst = 0x98000000980 p = 0x180000000 <error: Cannot access memory at address 0x180000000> st = {st_dev = 115, st_ino = 321140, st_nlink = 2, st_mode = 16888, st_uid = 0, st_gid = 0, __pad0 = 0, st_rdev = 0, st_size = 40, st_blksize = 4096, st_blocks = 0, st_atim = {tv_sec = 1712844094, tv_nsec = 899597355}, st_mtim = {tv_sec = 1712844094, tv_nsec = 899597355}, st_ctim = {tv_sec = 1712844094, tv_nsec = 899597355}, __glibc_reserved = {0, 0, 0}} --Type <RET> for more, q to quit, c to continue without paging-- l1 = 2048 tbuf = "p\233\355\255\374\177\000\000\310%ǂ~\177\000\000\020D\373\202~\177\000\000\000\000\000\000\000\000\000\000\360\233\355\255\374\177\000\000\000\000\000\000\000\000\000\000\360\233\355\255\374\177", '\000' <repeats 18 times>, "`\307\373\202~\177\000\000\350\204\376\202~\177\000\000\204\311\373\202~\177\000\000\060\304\373\202~\177\000\000Hp\376\202~\177\000\000\000\300\373\202~\177\000\000\000\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000@\342ł~\177", '\000' <repeats 66 times>... option_index = 12 long_options = {{name = 0x55c5756ba886 "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x55c5756b554c "version", has_arg = 0, flag = 0x0, val = 118}, {name = 0x55c5756ba88b "alias", has_arg = 1, flag = 0x0, val = 1024}, {name = 0x55c5756ba891 "subst", has_arg = 1, flag = 0x0, val = 1025}, {name = 0x55c5756ba897 "substdef", has_arg = 1, flag = 0x0, val = 1026}, {name = 0x55c5756ba8a0 "substdefs", has_arg = 1, flag = 0x0, val = 1027}, {name = 0x55c5756ba8aa "server-id", has_arg = 1, flag = 0x0, val = 1028}, {name = 0x55c5756ba8b4 "loadmodule", has_arg = 1, flag = 0x0, val = 1029}, {name = 0x55c5756ba8bf "modparam", has_arg = 1, flag = 0x0, val = 1030}, {name = 0x55c5756ba8c8 "log-engine", has_arg = 1, flag = 0x0, val = 1031}, {name = 0x55c5756ba8d3 "debug", has_arg = 1, flag = 0x0, val = 1032}, { name = 0x55c5756ba8d9 "cfg-print", has_arg = 0, flag = 0x0, val = 1033}, {name = 0x55c5756ba8e3 "atexit", has_arg = 1, flag = 0x0, val = 1034}, {name = 0x55c5756ba8ea "all-errors", has_arg = 0, flag = 0x0, val = 1035}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}} __func__ = "main" ```

#### 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). -->

``` 0(713842) WARNING: tls [tls_mod.c:747]: mod_register(): OpenSSL 1.1.1 setting cryptorand random engine 0(713842) INFO: rtimer [rtimer_mod.c:298]: stm_t_param(): created rtimer name=iptables interval=60 mode=1 0(713842) INFO: <core> [core/tcp_main.c:5205]: init_tcp(): using epoll_lt as the io watch method (auto detected) loading modules under config path: /usr/local/lib64/kamailio/modules/ Listening on udp: 81.31.45.42 [81.31.45.42]:5060 udp: 81.31.45.42 [81.31.45.42]:6688 udp: 81.31.45.42 [81.31.45.42]:443 udp: 81.31.45.42 [81.31.45.42]:6699 tcp: 81.31.45.42 [81.31.45.42]:5060 tcp: 81.31.45.42 [81.31.45.42]:443 tcp: 81.31.45.42 [81.31.45.42]:6688 tcp: 81.31.45.42 [81.31.45.42]:6699 tls: 81.31.45.42 [81.31.45.42]:5061 tls: 81.31.45.42 [81.31.45.42]:6689 tls: 81.31.45.42 [81.31.45.42]:6670 Aliases: *: sip2.gope.cz:* *: sipo.smartel.cz:* *: sipi.smartel.cz:* *: siptest.odorik.cz:* *: *.odorik.cz:*

0(713844) INFO: rr [../outbound/api.h:53]: ob_load_api(): unable to import bind_ob - maybe module is not loaded 0(713844) INFO: rr [rr_mod.c:185]: mod_init(): outbound module not available 0(713844) INFO: geoip2 [geoip2_mod.c:96]: mod_init(): using GeoIP database path /var/kamailio/GeoLite2-City-17.06.22.mmdb, library version 1.5.2 0(713844) INFO: cfgutils [cfgutils.c:829]: mod_init(): no hash_file given, disable hash functionality 0(713844) INFO: regex [regex_mod.c:417]: load_pcres(): num groups = 1 0(713844) INFO: regex [regex_mod.c:419]: load_pcres(): <group[0]>(((^[1-9]\d{5}$))|((^ukrb[12]$)))</group[0]> (size = 33) 0(713842) ERROR: <core> [core/daemonize.c:302]: daemonize(): Main process exited before writing to pipe

```

#### 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

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. -->

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` kamailio -v version: kamailio 5.8.1 (x86_64/linux) 215af5-dirty flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, 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_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_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: 215af5 -dirty compiled on 15:32:24 Apr 11 2024 with gcc 10.2.1 ```

* **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`) -->

``` lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 11 (bullseye) Release: 11 Codename: bullseye

uname -a Linux serZT 6.1.0-18-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.76-1 (2024-02-01) x86_64 GNU/Linux ```