MaxScale crashes every few minutes.

I've installed the packages from http://maxscale-jenkins.mariadb.com/ci-repository/release-1.2.1/mariadb-maxscale/

maxscale.cnf:
[maxscale]
threads=16
log_trace=0
log_debug=0

[Galera Monitor NL]
type=monitor
module=galeramon
servers=server1nl,server2nl,server3nl
user=debian-sys-maint
passwd=PW
monitor_interval=1000

[Galera Monitor IT]
type=monitor
module=galeramon
servers=server1it,server2it,server3it
user=debian-sys-maint
passwd=PW
monitor_interval=1000

[topfilter]
type=filter
module=topfilter
count=10
filebase=/tmp/QueryLog

[fetch]
type=filter
module=regexfilter
match=fetch
replace=select

[hint]
type=filter
module=hintfilter

[RW Split Router NL]
type=service
router=readwritesplit
servers=server1nl,server2nl,server3nl
user=debian-sys-maint
passwd=PW
enable_root_user=1

[RW Split Router IT]
type=service
router=readwritesplit
servers=server1it,server2it,server3it
user=debian-sys-maint
passwd=PW
enable_root_user=1

[Debug Interface]
type=service
router=debugcli

[CLI]
type=service
router=cli

[RW Split Listener NL]
type=listener
service=RW Split Router NL
protocol=MySQLClient
address=10.192.51.214
port=3306

[RW Split Listener IT]
type=listener
service=RW Split Router IT
protocol=MySQLClient
address=10.192.51.215
port=3306

[Debug Listener]
type=listener
service=Debug Interface
protocol=telnetd
address=127.0.0.1
port=4442

[CLI Listener]
type=listener
service=CLI
protocol=maxscaled
port=6603

[server1nl]
type=server
address=10.192.51.217
port=3306
protocol=MySQLBackend
persistpoolmax=10
persistmaxtime=360

[server2nl]
type=server
address=10.192.51.227
port=3306
protocol=MySQLBackend
persistpoolmax=10
persistmaxtime=360

[server3nl]
type=server
address=10.192.51.237
port=3306
protocol=MySQLBackend
persistpoolmax=10
persistmaxtime=360

[server1it]
type=server
address=10.192.51.218
port=3306
protocol=MySQLBackend
persistpoolmax=10
persistmaxtime=360

[server2it]
type=server
address=10.192.51.228
port=3306
protocol=MySQLBackend
persistpoolmax=10
persistmaxtime=360

[server3it]
type=server
address=10.192.51.238
port=3306
protocol=MySQLBackend
persistpoolmax=10
persistmaxtime=360

error.log:
MariaDB Corporation MaxScale /var/log/maxscale/error6.log Wed Oct 28 13:42:42 2015
-----------------------------------------------------------------------
— Logging is enabled.
2015-10-28 13:43:17 Backend hangup error handling.
2015-10-28 13:43:17 Backend hangup -> closing session.
2015-10-28 13:43:17 Backend hangup error handling.
2015-10-28 13:43:17 Fatal: MaxScale 1.2.1 received fatal signal 11. Attempting backtrace.
2015-10-28 13:43:17 Commit ID: f70efcd2b603864e726cc2326437948d92cb9c04 System name: Linux Release string: Ubuntu 14.04.3 LTS Embedded library version: 5.5.42-MariaDB
2015-10-28 13:43:17 /usr/bin/maxscale() [0x54a4a3]
2015-10-28 13:43:17 /lib/x86_64-linux-gnu/libpthread.so.0(+0x10340) [0x7f821ed91340]
2015-10-28 13:43:17 /usr/lib/x86_64-linux-gnu/maxscale/libreadwritesplit.so(+0x78d8) [0x7f8202cca8d8]
2015-10-28 13:43:17 /usr/lib/x86_64-linux-gnu/maxscale/libreadwritesplit.so(+0x77aa) [0x7f8202cca7aa]
2015-10-28 13:43:17 /usr/lib/x86_64-linux-gnu/maxscale/libMySQLClient.so(+0x90ad) [0x7f82016560ad]
2015-10-28 13:43:17 /usr/lib/x86_64-linux-gnu/maxscale/libMySQLClient.so(+0x7055) [0x7f8201654055]
2015-10-28 13:43:17 /usr/bin/maxscale() [0x5625f2]
2015-10-28 13:43:17 /usr/bin/maxscale(poll_waitevents+0x6d4) [0x561bcb]
2015-10-28 13:43:17 /lib/x86_64-linux-gnu/libpthread.so.0(+0x8182) [0x7f821ed89182]
2015-10-28 13:43:17 /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f821da8c47d]