bug#53136: 28.0.90; segfault in lock_file

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: 53136@debbugs.gnu.org
> Date: Sun, 09 Jan 2022 21:00:53 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > What is the contents of lock_info.user upto the first null byte?
> 
> It's "oldosfan" (which is correct).

No, it's not: it should be of the form USER@HOST.PID[:BOOT-TIME].  See
the commentary around line 288 in filelock.c.  The string is generated
in lock_file_1.  maybe you can step into it and see what happens
there.

What is "oldosfan"? is it the user or the host name?