Hello,

On Sat 22-08-20 16:22:16, Ye Bin wrote:
> Ye Bin (2):
>   ext4: Add comment to BUFFER_FLAGS_DISCARD for search code
>   jbd2: Fix race between do_invalidatepage and init_page_buffers
> 
>  fs/buffer.c                 | 12 +++++++++++-
>  fs/jbd2/journal.c           |  7 +++++++
>  include/linux/buffer_head.h |  2 ++
>  3 files changed, 20 insertions(+), 1 deletion(-)

Thanks for the good description of the problem and the analysis. I could
now easily understand what was really happening on your system. I think the
problem should be fixed differently through - it is a problem of
block_write_full_page() that it invalidates buffers while JBD2 is working
with them. Attached patch should also fix the problem. Can you please test
whether it fixes your testcase as well? Thanks!

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR