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### Description

I upgraded from 4.2 to latest commit on master branch.

During migrating, I found mi was replaced by RPC, (https://www.kamailio.org/wiki/install/upgrade/4.4.x-to-5.0.0) and when I tested with command like `sh kamctl ps`, it showed:

``` # sh kamctl ps awk: bad regex '^{.+"id"[ ]*:[ ]*[0-9]+[ ]*}$': Invalid preceding regular expression ``` I also tested it in standard configuration on my PC according to the following steps: ``` make cfg make all make install ```

and it works

``` # sh kamctl ps { "jsonrpc": "2.0", "result": [ { "IDX": 0, "PID": 30916, "DSC": "main process - attendant" }, { "IDX": 1, "PID": 30917, "DSC": "udp receiver child=0 sock=127.0.0.1:5060" }, { "IDX": 2, "PID": 30918, "DSC": "udp receiver child=1 sock=127.0.0.1:5060" }, { "IDX": 3, "PID": 30919, "DSC": "udp receiver child=2 sock=127.0.0.1:5060" ....

```

My configuration settings and install steps are like followings:

CC=/opt/toolchains/aarch64-thunderx/bin/aarch64-thunderx-linux-gnu-gcc make cfg ARCH=aarch64 LOCALBASE=/mnt/test/kamailio/ make all make install

Any suggestion??

### Troubleshooting

#### Reproduction

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#### Debugging Data

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gdb /path/to/kamailio /path/to/corefile bt full info locals list

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

#### Log Messages

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#### SIP Traffic

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``` (paste your sip traffic here) ```

### Possible Solutions

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### Additional Information

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

``` # ./kamailio -v version: kamailio 5.2.0-dev3 (aarch64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT-NOSMP, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled on 14:28:54 Feb 7 2018 with /opt/toolchains/aarch64-thunderx/bin/aarch64-thunderx-linux-gnu-gcc 5.3.0 ```

* **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 `uname -a`) -->

``` Linux XXX 4.4.13 #1 SMP PREEMPT Fri Mar 24 10:50:44 CST 2017 aarch64 GNU/Linux ```