Segmentation fault when files are deleted

[gwsw]

(Reposting report that was submitted via email.)

I have experienced a 'Segmentation fault' in less 633 when 3 or more of the files being viewed are deleted by other process and I try to view one of the deleted files with the command ':p'. For example:

less foo a b c
:n (shows a)
:n (shows b)
:n (shows c)
(here somebody else deletes files a, b, and c)
:p (b: No such file or directory (press RETURN))
(I press RETURN)
:p (c: No such file or directory (press RETURN))
(I press RETURN)
:p (a: No such file or directory (press RETURN))
(I press RETURN)
Segmentation fault

I attach a valgrind log. It seems that del_ifile (ifile.c:146) does not remove all the references to the IFILE it frees, and some stale pointer is used later to access and free again the same IFILE. The next and prev pointers saved in reedit_ifile (edit.c:872) might be the cause, I'm not sure.

[gwsw]

less-633-segfault.log

[gwsw]

Fixed in 6446450.