Bug on IAX

I have found a bug in the IAX channel.

After a long conversation, about 12 to 24 hours, it happens that the ingress buffers of the IAX channels don’t stop increasing and the memory used by Asterisk on the system increase as well.
As soon as the conversation is stopped, the buffers stop increasing.
BUT the memory used by Asterisk is still the same, so that the Linux system crashes because of a lack of memory.

Has someone a solution to quiet down this bug?