David,

Just to recap 

It seems that the latest jffs2 CVS code does not flush wbuf when the 
filesystem is remounted read only. This can cause a gc operation to be 
abnormally terminated an error messages are generated on remount.

A while ago you suggested I do something like this. See attached 

I don't really know how to create a patch file so here is a diff and a patch.
If the patch is not correct would you please enlighten me.