[Yaffs] writeable mmap support

Hi all! I'm working on a system using yaffs2 (kernel 2.6.14, yaffs
v1.132005/11/07). All is working fine, except we are seeing test
failures when
running some LTP IO tests using mmap()'d files. A basic write/read test is
returning errors saying the data doesn't match what was written.

I've also noticed that mmap()'d writing causes bad blocks to be found very
quickly, even though much longer regular read/write tests do not.

Are there known problems with mmap()'d writing, or bugs from that era that
anyone can remember?

Thanks!
ken