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### Description

ims_registrar_pcscf module create a process with rank 1 (PROC_SIPINIT) if reginfo flag is open..

This is wrong because it is written that PROC_SIPINIT rank should be given only to the first worker process.

``` #define PROC_SIPINIT 1 /**< First (special) SIP worker - some modules do special processing in this child, like loading db data */ ```

This leads to a problem. ims_usrloc_pcscf loads registration records from the db twice.

The codes are demonstrated below.

Similar old issue exists here for another module: https://github.com/kamailio/kamailio/issues/975

### Troubleshooting

#### Reproduction

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#### Debugging Data

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``` (paste your debugging data here) ```

#### Log Messages

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Here are fork operations and their ranks:

``` [root@n5gc-ims-dev src]# cat /usr/src/erhan5.log | grep init_mod_child | grep ims_usrloc_pcscf 0(10662) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 0 rank -127: ims_usrloc_pcscf [main] 1(10671) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 1 rank 1: ims_usrloc_pcscf [udp receiver child=0 sock=10.10.12.101:5060 (172.30.65.101:5060)] 3(10673) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 3 rank 3: ims_usrloc_pcscf [udp receiver child=2 sock=10.10.12.101:5060 (172.30.65.101:5060)] 2(10672) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 2 rank 2: ims_usrloc_pcscf [udp receiver child=1 sock=10.10.12.101:5060 (172.30.65.101:5060)] 5(10675) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 5 rank -1: ims_usrloc_pcscf [slow timer] 0(10662) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 0 rank 0: ims_usrloc_pcscf [main] 6(10679) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 6 rank -1: ims_usrloc_pcscf [timer] 4(10674) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 4 rank 4: ims_usrloc_pcscf [udp receiver child=3 sock=10.10.12.101:5060 (172.30.65.101:5060)] 7(10680) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 7 rank -1: ims_usrloc_pcscf [secondary timer] 8(10686) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 8 rank 1: ims_usrloc_pcscf [RegInfo Event Processor] 9(10687) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 9 rank -1: ims_usrloc_pcscf [Dialog Clean Timer] 10(10688) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 10 rank -2: ims_usrloc_pcscf [ctl handler] 11(10689) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 11 rank 5: ims_usrloc_pcscf [tcp receiver (generic) child=0] 12(10694) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 12 rank 6: ims_usrloc_pcscf [tcp receiver (generic) child=1] 13(10695) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 13 rank 7: ims_usrloc_pcscf [tcp receiver (generic) child=2] 14(10697) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 14 rank 8: ims_usrloc_pcscf [tcp receiver (generic) child=3] 15(10699) DEBUG: <core> [core/sr_module.c:845]: init_mod_child(): idx 15 rank -4: ims_usrloc_pcscf [tcp main process]

```

#### 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

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In following code ims_registrar_pcscf module create a process with rank 1 (PROC_SIPINIT) : fork_process(PROC_SIPINIT, "RegInfo Event Processor", 1);

```

static int child_init(int rank) {

LM_DBG("Initialization of module in child [%d] \n", rank); if ((subscribe_to_reginfo == 1) && (rank == PROC_MAIN)) { LM_DBG("Creating RegInfo Event Processor process\n"); int pid = fork_process(PROC_SIPINIT, "RegInfo Event Processor", 1); if (pid < 0) return -1; //error if (pid == 0) { if (cfg_child_init()) return -1; //error reginfo_event_process(); } }

if (rank == PROC_MAIN || rank == PROC_TCP_MAIN) return 0; if (rank == 1) { /* init stats */ //TODO if parameters are modified via cfg framework do i change them? //update_stat( max_expires_stat, default_registrar_cfg.max_expires ); update_stat( max_contacts_stat, default_registrar_cfg.max_contacts ); update_stat( default_expire_stat, default_registrar_cfg.default_expires ); }

/* don't do anything for main process and TCP manager process */ if (rank == PROC_MAIN || rank == PROC_TCP_MAIN) return 0;

return 0; } ```

Here is how ims_usrloc_pcscf loads records from db at its child init callback function:

``` if (_rank==PROC_SIPINIT && db_mode!=DB_ONLY) { // if cache is used, populate domains from DB for( ptr=root ; ptr ; ptr=ptr->next) { LM_DBG("Preloading domain %.*s\n", ptr->name.len, ptr->name.s); if (preload_udomain(ul_dbh, ptr->d) < 0) { LM_ERR("child(%d): failed to preload domain '%.*s'\n", _rank, ptr->name.len, ZSW(ptr->name.s)); return -1; } } } ```

### Additional Information

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

``` it exists at latest version on master branch. [here](https://github.com/kamailio/kamailio/blob/master/src/modules/ims_registrar_p...) ```

* **Operating System**:

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``` CentOS 7.1 ```