OK, I am testing master too.
I have started the load tests. I should have results within 24 hours. However, latest commit 8d8e1b9 of master is logging this:

2015-08-27T14:36:07.034018+09:00 lab002187-flip-server /usr/local/src/git/kamailio-devel/kamailio[1958]: ERROR: db_mysql [km_dbase.c:121]: db_mysql_submit_query(): driver error on query: Column 'caller_contact' cannot be null
2015-08-27T14:36:07.034032+09:00 lab002187-flip-server /usr/local/src/git/kamailio-devel/kamailio[1958]: ERROR: [db_query.c:235]: db_do_insert_cmd(): error while submitting query
2015-08-27T14:36:07.034039+09:00 lab002187-flip-server /usr/local/src/git/kamailio-devel/kamailio[1958]: ERROR: dialog [dlg_db_handler.c:803]: update_dialog_dbinfo_unsafe(): could not add another dialog to db

This doesn't cause the test calls to fail but of course, it means the dialog data will not be serialized to DB so it will not survive a restart/switchover.

Here is the kamailio version info:

[root@lab002187-flip-server ~]# kamctl fifo version
Server:: kamailio (4.4.0-dev2 (x86_64/linux))
Build:: mi_core.c compiled on 08:08:00 Aug 27 2015 with gcc 4.4.7
Flags:: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, F_MALLOC, DBG_F_MALLOC, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
GIT:: 8d8e1b

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