bug#8162: 23.3; Crash with invalid default-process-coding-system value

[Chong Yidong]

Kenichi Handa <handa@m17n.org> writes:

> The attached patch (against emacs-23 branch) will fix this
> bug.  Perhaps "XPROCESS (process)->pid = -1" should be done
> much earlier because an error may be signaled before, but,
> I'm not sure.  deactivate_process may not handle such
> situation well.
>
> By the way, as Emacs 23.2 also had this bug, strictly
> speaking, the fix is not for regression.  Should I install
> it for emacs-23 or for emacs-24?

This patch doesn't look at all safe.  At the very least, if it's
included, we'd need another pretest.  But I'm not inclined to include it
for 23.3.  Although it's a crash, (i) both 23.1 and 23.2 have the same
bug, and (ii) the trigger seems quite unusual.

Stefan, WDYT?