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Date: Tue, 12 Mar 2013 16:14:51 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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Subject: dtrace: operands have incompatible types: "dmu_buf_t **" = "dmu_buf_t
 **"
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For your amusement:

============= testcase.d =============
dmu_buf_t **buf;
/* Remove the following line to defuse. */
bpobj_t *bpobj;

fbt::dmu_bonus_hold:entry
{
	buf = args[3]; /* the error is about this line */
}
=======================================

I think I know what's going on, but I am still making sure that that's true.

-- 
Andriy Gapon