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Drop sequencer mutex around uiomove() and make sure we don't move more bytes

Description

Drop sequencer mutex around uiomove() and make sure we don't move more bytes
than is available, else a panic might happen.

Found by: Peter Holm <peter@holm.cc>
MFC after: 3 days
Sponsored by: Mellanox Technologies

Details

Provenance
hselaskyAuthored on
Parents
rS339581: Fix off-by-one which can lead to panics.
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