hi,

> > Could please somebody look at kern/26937 and confirm (or disprove) it?
> 
> I propose to remove the test for the time being, (one line code change
> plus one line comment change) and pull up to the release branch.

no strong objection from me.  but see below.

> The case caught which panics in 26973 (MT_DATA vs. MT_PKTHDR) is only
> very vaguely described in the mbuf documentation, be it online or in the
> literature, and it doesn't surprise me that more cases of this type
> difference are found; half of the test (introduced in 1.72 of uipc_mbuf.c
> I think) was already removed on the 1.78 to remove a similar panic for
> DIAGNOSTIC.

you can find the following comment in uipc_mbuf.c since rev.1.1.
	Both chains must be of the same type (e.g. MT_DATA).

YAMAMOTO Takashi