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2021-07-16T17:47:40.276813Z
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sbuf(9): Add NOWAIT dynamic buffer extension mode

The goal is to avoid some kinds of low-memory deadlock when formatting
heap-allocated buffers.

Reviewed by:	vangyzen
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D21015

(cherry picked from commit 71db411eb627601a5f9a3464f88d75741927ce60)

Git Hash:   81999965113107eb9cecc217a4f496dd78c1ca3a
Git Author: cem@FreeBSD.org
END