I trust you that the backport is right, but I see a bunch of added mergeinfo data which I'm not sure if it's an artifact of the review system:

Merged /projects/lldb-r201577/sys:r262185-262527
Merged /stable/10/usr.bin/head/sys:r265256
Merged /projects/clang-sparc64/sys:r262258-262612
Merged /projects/pf/head/sys:r263908
Merged /projects/elftoolchain/sys:r260880
Merged /projects/zfsd/head/sys:r266519,269993
Merged 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Merged /projects/building-blocks/sys:r275142-275143,275306-275307,275556,275558,277445,277670,277673

AFAICT mergeinfo should only be modified for stable/10, and only the revision that's being MFC'ed should be added.

I also see such mergeinfo in the svn diff output. I am not sure why it happens and how it could effect the commit. What I did was:

From my 10 stable workspace I typed:

/usr/10stable-src % svn merge -c r282212 svn+ssh://svn.freebsd.org/base/head/sys sys

Then I just generate the arc diff under that same directory:

/usr/10stable-src % arc diff --create

I don't know why all other commits got into the mergeinfo. Is this the right procedure to merge?

In D2574#47664, @whu wrote:

I also see such mergeinfo in the svn diff output. I am not sure why it happens and how it could effect the commit. What I did was:

From my 10 stable workspace I typed:

/usr/10stable-src % svn merge -c r282212 svn+ssh://svn.freebsd.org/base/head/sys sys

I'm not sure you can do it that way, I always have done it from the same svn checkout, as described in https://www.freebsd.org/doc/en_US.ISO8859-1/articles/committers-guide/subversion-primer.html. If you are doing it from the same tree:

$ cd stable/10
$ svn merge -c r282212 ^/head/ checkout

Should DTRT.