在 2020/11/16 21:50, Mauricio Oliveira 写道:
Hi Kun,
On Sat, Nov 14, 2020 at 5:18 AM yangerkun <yangerkun@xxxxxxxxxx> wrote:
While using ext4 with data=journal(3.10 kernel), we meet a problem that
we think may never happend...
[...]
Could you please confirm you mean 5.10-rc* kernel instead of 3.10?
(It seems so as you mention a recent commit below.) Thanks!
For now, what I have seen that can dirty buffer directly is
ext4_page_mkwrite(64a9f1449950 ("ext4: data=journal: fixes for
ext4_page_mkwrite()")), and runing ext4_punch_hole with keep_size
/ext4_page_mkwrite parallel can trigger above warning easily.
[...]
Hi,
Sorry for the long delay reply... And thanks a lot for your advise! The
bug trigger with a very low probability. So won't trigger with 5.10 can
not prove no bug exist in 5.10.
Google a lot and notice that someone before has report the same bug[1].
'3b136499e906 ("ext4: fix data corruption in data=journal mode")' seems
fix the problem. I will try to understand this, and give a analysis
about how to reproduce it!
Thanks,
Kun.
