bug#35061: 27.0.50; Pressing C-\ in term-mode while program is running crashes the program.

[Sergey Trofimov]

If I press C-\ (bound to term-send-raw) while some non-interactive
program is running in term-mode then the program crashes with nothing
suspicious in core dump. I've tried this in emacs 27.0.50 and emacs
26.1 started with -Q on Debian Linux.

So, to reproduce this, start term-mode with any shell, enter sleep 5 and
while the program is running press C-\. If I start program which expects
input from stdin (less, for example) then this bug doesn't appear.