On Tue, May 18, 2021 at 03:09:40PM +0800, Qu Wenruo wrote:

v3:
- Change the fix for the btrfs/215 hang
  Now we choose to skip the locked page, leaving both its Ordered bit
  and ordered extent accounting to be handled by run_delalloc_range()
  error hanlding path.

  This fixes a possible ordered extent underflow, and removes a forward
  declaration.

There are 2 finished fstests runs and it did hang or crash so it seems
to be fixed, thanks. I haven't verified individual tests that reported
some output mismatch, so can't say if they're known false positives or
possibly related to your patches. I'll try to take a look tomorrow.