Description

Calling functions from the dialplan module in 5.8 (dp_translate(), dp_match()) results in the following line being logged:

WARNING: <core> [core/mem/q_malloc.c:520]: qm_free(): WARNING: free(0) called from dialplan: dp_db.c: pcre2_free(206)

Is this a functional problem, or just a case of overly aggressive logging?

Troubleshooting

Reproduction

Reproducible with the following kamailio config:

#!KAMAILIO

loadmodule "pv"
loadmodule "db_sqlite"
loadmodule "xlog"
loadmodule "dialplan"

disable_tcp = true
force_rport = true

!!define DBFILE /etc/kamailio/kamailio.sqlite

modparamx("db_sqlite","db_set_readonly", "$def(DBFILE)")

modparamx("dialplan","db_url", "sqlite:///$def(DBFILE)")
modparam("dialplan", "attrs_pvar", "$avp(dp_attrs)")

request_route {
    if ( $rm == "ACK" ) {
        exit;
    }

    xinfo("$ci New request\n");

    dp_match("1", "$rU");
    exit;
}

The warning log is issued in 5.8 but not 5.7. Reproduced by sending a request with SIPp:

sipp -sn uac  -m 1 -s 15554445555 localhost

Possible Solutions

Not sure if this is just a case of logging being overly aggressive, or an issue with the module's memory management.

Additional Information

• Kamailio Version - output of kamailio -v

version: kamailio 5.8.1 (x86_64/linux)
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: unknown
compiled with gcc 12.2.0

Tested using docker debian:12-slim using the official packages from http://deb.kamailio.org/kamailio58

• Operating System:

Docker debian:12-slim, but also observed in Alpine Linux/

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