Philip Guenther <guent...@gmail.com> wrote:

> The warning is not that a single filesystem is being locked recursively by a 
> single
> thread, but just that a single thread is holding locks on multiple 
> filesystems.

vfs_stall() needs to grab locks on all filesystems, to stop a variety of
filesystem transactions.  (Other types of transactions are blocked in other
ways).

sys_umount() grabs locks on all filesystems above it, to stop anyone from
doing a parallel mount/unmount along the same path.

This is all normal.

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