infinite memory usage, possible leak

Under 2.3.5 the memory usage keeps increasing over time, until the machine finally goes OOM.
I did manage to make a core dump of the process but running under valgrind for a long time isn't something I managed to do.

The config is as follows

[Read-Write-Service]

type=service

router=readwritesplit

servers=db1,db2,db3

user=maxscale

password=XXX

connection_keepalive=30

#max_sescmd_history=50

disable_sescmd_history=true

master_accept_reads=false

master_failure_mode=fail_on_write

enable_root_user=true

#master_reconnection=true

#prune_sescmd_history=true

#session_track_trx_state=true

causal_reads=true

causal_reads_timeout=2

as you can see I already disabled sescmd history to rule this out. The core dump is quite large and I cannot upload it publicly as I'm not sure it doesn't contain any sensitive data but if there is anything I can do with it to help out please let me know.