rong1129/android-binder-ipc — comment on commit bdc050fcf0b7f33a310a01557c6cfea417a954df
File:  line 0
By syndtr:

The crasses can be caused by the buffer that allocated by fast slob is not well aligned. I implementing your fast slob in the old binder and get BUS_ADRALN, which mean Invalid address alignment.
Fix it with this:
#define MAX_ALLOC_SIZE	98304
#define ALLOC_SIZE_SHIFT	3
#define NUM_BUCKETS	4

The NUM_BUCKETS must not be odd number. Hope it helps.