netdev - rhashtable issue

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Message-ID: <i3vf5e63aqbfvoywuftt7h3qd4abdzomdeuvp3ygmzgza4xjdt@qx36kyyxxkfi>
Date: Sat, 23 Nov 2024 12:21:21 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Thomas Graf <tgraf@...g.ch>, Herbert Xu <herbert@...dor.apana.org.au>
Cc: netdev@...r.kernel.org
Subject: rhashtable issue - -EBUSY

I'm seeing an issue where rhashtable inserts sporadically return -EBUSY,
thrown from rhashtable_insert_rehash() when there's already a rehash in
progress, i.e. rehashes aren't keeping up.

This looks like a clear bug, the -EBUSY isn't handled at all, nor is it
documented, and inserts shouldn't randomly fail.

Looking through the history it's hard to tell what the intention of the
code is...