Hi Neil,
In commit 18a25da8 ("dm: ensure bio submission follows a depth-first
tree walk") you've added a call to bio_clone_bioset to
__split_and_process_bio. Unlike all other bio splitting code this
actually allocates a new bio_vec array instead of just splitting the bio
and the iterator. I can't actually find a good reason for that either
in a cursory review of the code, the commit or the comments.
Do you remember why this can't just use bio_clone_fast?
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