It's a no-no to acquire locks in these "fast" messenger methods. This
can lead to messenger slow downs in the best case as it's blocking reads
on the wire. In the worse case, the messenger may deadlock with other
threads, preventing any further message reads off the wire.
It's not obvious this method is "fast" so I've added a comment regarding
this.
Fixes: https://tracker.ceph.com/issues/61874 Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
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