8.1.0350's Test_exit_cb_wipes_buf() causes segfault when building on Launchpad

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Hi!

I'm not posting an issue on GitHub as I don't know this is a Vim issue
rather than a Launchpad/pbuild/sbuild issue.

The 8.1.350 patch release [1] introduces `Test_exit_cb_wipes_buf()`.
This causes a segfault when `make test` is run - but only on Launchpad.
When I run a `make; make test` locally, outside of any build
environment, the tests all pass and don't crash. Removing the test,
therefore bypassing it, (pretty obviously) allows the process to
complete but that's hardly ideal.

A full failed build log is available at [2], the main highlight being
(L41950):

> Executing Test_exit_cb_wipes_buf() Vim: Caught deadly signal SEGV
> Vim: Finished.
> Segmentation fault (core dumped)
> Makefile:130: recipe for target 'test_channel.res' failed

One of the difficulties debugging Launchpad is creating an equivalent
local environment - Vim tests haven't completed in my local pbuilder
environment for a long while (which may be something I've done).

However, I'm hoping someone will already know what might cause this as
the test has a comment:

> This caused a crash, because messages were handled while peeking for a character.

I'm aware this may not be much to go on let me know what other
information I can provide to help find the root cause.

Best,

Jonathon


[1]
https://github.com/vim/vim/commit/0b1468884a2a1c5d3442cbb7119330e307f0aa3d#diff-0df32bc2f6721af01944a6045df14b1fR1363
[2]
https://launchpadlibrarian.net/388034031/buildlog_ubuntu-xenial-amd64.vim_2%3A8.1.0349+really.v8.1.0369-0york0~ubuntu16.04.1_BUILDING.txt.gz

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