I'm running 4.0.25 on NetBSD 3 on an amd64. It appears that the 
key_buffer_size is being truncated to 4GB, even though I've set
it larger.

Could someone give me a hint about where to look? I'm a little
suspicious of ha_resize_key_cache() which is using longs internally
to hold the keybuff_size, but I suspect this is not quite the
source of the problem (there's no logic here to truncate the
input value).

Thanks,
chris