bug#44642: 27.1; read-string does not signal on EOF after calling server-eval-at

[Eli Zaretskii]

> From: Chris Hunt <chrahunt@gmail.com>
> Date: Sat, 14 Nov 2020 11:46:42 -0500
> 
> On my machine, this outputs:
> 
> #+begin_src text
> [script] test 1
> Received ’notest’
> Error reading from stdin
> [script] test 1 complete
> [script] test 2
> Received ’test’
> Sending request to server
> Response received from server ’hello from server’
> #+end_src
> 
> and hangs. According to `top', the non-daemon process is consuming
> 100% of a CPU core.
> 
> xbacktrace in gdb of the non-daemon emacs shows
> 
> #+begin_src text
> "read-string" (0xb5783470)
> "eval-buffer" (0xb5783660)
> "load-with-code-conversion" (0xb5783928)
> "load" (0xb5783c18)
> "command-line-1" (0xb5784260)
> "command-line" (0xb5784ac8)
> "normal-top-level" (0xb5784e20)
> #+end_src

Please show also the C-level backtrace from GDB.

Thanks.