On Sun, Feb 12, 2023 at 08:02:37AM +0200, Eli Zaretskii wrote:
> > From: Christoph Groth <christoph@grothesque.org>
> > Date: Sat, 11 Feb 2023 22:16:52 +0100
> > 
> > I just noticed something that made me doubt my own sanity:  With Emacs
> > 27.1 (from Debian stable running Debian’s Linux kernel
> > 6.0.0-0.deb11.6-amd64) the command
> > 
> >   emacs -q -nw /proc/cpuinfo
> > 
> > reproducibly opens cpuinfo only up to a portion of line 272, while the
> > entire file is 560 lines long on that machine.  I checked on a different
> > machine (with same Emacs), and I see the same behavior.
> > 
> > C-u C-x = tells that the file is read up to position 16384 (= 2^14).
> > 
> > Running M-x revert-buffer loads the whole file...
> > 
> > Is/was this a known issue?  I could not find anything on the web.
> 
> Please report this as a bug.

I think the bug is already there (#9800) [1]

[1] https://lists.gnu.org/archive/html/bug-gnu-emacs/2022-02/msg00459.html

Cheers
-- 
t