On Mon, Feb 09, 2026 at 10:33:15AM -0700, Keith Busch wrote:

quoted

This is not clear to me. Why are concurrent queue freezes not allowed
while debugfs attributes are created? I don't see any code in debugfs
that calls back into the block layer while creating debugfs attributes?
Did I perhaps overlook something?

I had to look up the original commit that introduced the WARN,
65d466b629847. The commit message says "Creating new debugfs entries can
trigger fs reclaim", so that must be the path that enters back into the
blaock layer request_queue.

Another way to solves this would be to scope all the debugs action
as NOIO context.