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sbuf_cpy() resets the sbuf state, which is wrong for sbufs allocated by sbuf_new_for_sysctl(). In particular, this code triggers an assertion failure in sbuf_clear(). Simplify by just using sysctl_handle_string() for both reading and setting the tunable. Fixes: 6930ecb ("spa: make read/write queues configurable") Reported-by: Peter Holm <pho@FreeBSD.org> Signed-off-by: Mark Johnston <markj@FreeBSD.org>
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