On Wed, Jun 23, 2021 at 03:49:52PM -0400, Theodore Ts'o wrote:

CC'ed Josh since he was testing this patchset.

On Wed, Jun 23, 2021 at 09:13:42AM -0400, Theodore Ts'o wrote:

quoted

The conflicts were relatively minor, but the obvious fix-ups resulted
in a large number of crashes caused by various stress tests, such as
generic/068 and generic/204.  I'm currently investigating to see what
I might have messed up when I tried applying these patches, as well as
running your patch set applied against 5.12 to make sure the problems
weren't introduced by the patch set itself.

I applied this patch set on top of 5.12, where it applied w/o any
patch conflicts, and I'm still seeing large number of crashes[1].  The
crashes are in a wide variety of tests, and many of the stack traces
involve the ext4_discard_work workqueue.

I applied this on top of a96bfed64c8986d6404e553f18203cae1f5ac7e6, which
required some fixups. I didn't try to run any kind of intensive
stress-tests, but I've run the deletion performance test I mentioned, as
well as various software compiles and other miscellaneous work. I
haven't run into any apparent issues.