[Bug 293198] zfs deadlock while copying many files, vfs_deleteextattr_dir-related?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293198

--- Comment #15 from Peter Eriksson <[email protected]> ---
(In reply to Rick Macklem from comment #13)

Yep. A kernel with that patch seems to not deadlock with my test-script.

I'm not sure (haven't measured, just watching the count increase), but I also
have a feeling that it runs faster than without that patch as the number of
filesystems grow. 

Previously it visibly slowed down when it got up to around 2000 filesystems -
but that version of the test script didn't manage to provoke the deadlock (used
touch/mkdir/setextattr on files instead of using rsync to clone a template
filesystem).

Currently at loop # 7000 and no deadlock.

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