Re: FIle copy to FAT FS on NVDIMM hits BUG_ON at fs/buffer.c:3305!

On Wed, Jul 26, 2017 at 06:23:08PM +0900, OGAWA Hirofumi wrote: > The locking of this path seems to be broken. The guy familiar to > bdev_write_page() path will made real fix though, The following > patch should be explaining enough what is wrong. > > In short, clean_buffers() must be called before unlocking > lock_page(). Thanks for that.  This should fix the problem while not leaking the unlock_page call outside bdev_write_page. --- 8< --- Signed-off-by: Matthew Wilcox <mawilcox(a)microsoft.com&gt;