bug#34094: 27.0.50; (wrong-type-argument stringp (require . elec-pair)) with describe-function (and other commands)

[Tassilo Horn]

Tassilo Horn <tsdh@gnu.org> writes:

> It seems I have to start emacs from within the directory where the
> emacs.pdmp file resides.
>
> And then I'll get an
>
>   Fatal error 11: Segmentation faultfish: “emacs” terminated by signal SIGSEGV
> (Address boundary error)
>
> but that's another story.

Ok, I can reproduce the issue also at home with the current master
(8bf51c380acc04f25fba8f8aa3d1cc08b45f3e69).  When I start emacs not from
within emacs/src/, I get the original wrong-type-argument error as
described with my recipe.

One detail which might be important: I have symlinks to the emacs
executables in ~/bin/ which is on my PATH.

lrwxrwxrwx 1 horn horn   41 13. Nov 2014  ebrowse -> 
/home/horn/Repos/el/emacs/lib-src/ebrowse
lrwxrwxrwx 1 horn horn   35  1. Jan 2017  emacs -> 
/home/horn/Repos/el/emacs/src/emacs
lrwxrwxrwx 1 horn horn   45 13. Nov 2014  emacsclient -> 
/home/horn/Repos/el/emacs/lib-src/emacsclient
lrwxrwxrwx 1 horn horn   39 13. Nov 2014  etags -> 
/home/horn/Repos/el/emacs/lib-src/etags

So when I start emacs from anywhere but /home/horn/Repos/el/emacs/src/,
it'll print a lot of messages like:

Loading loadup.el (source)...
dump mode: nil
Using load-path (/usr/local/share/emacs/27.0.50/site-lisp 
/usr/local/share/emacs/site-lisp /home/horn/Repos/el/emacs/lisp 
/home/horn/Repos/el/emacs/lisp/emacs-lisp 
/home/horn/Repos/el/emacs/lisp/progmodes 
/home/horn/Repos/el/emacs/lisp/language 
/home/horn/Repos/el/emacs/lisp/international 
/home/horn/Repos/el/emacs/lisp/textmodes /home/horn/Repos/el/emacs/lisp/vc)
Loading emacs-lisp/byte-run...
Loading emacs-lisp/byte-run...done
Loading emacs-lisp/backquote...
Loading emacs-lisp/backquote...done
...

When I start it from within /home/horn/Repos/el/emacs/src/ where the
emacs executable and emacs.pdmp exists, I get no such messages.  Then,
however, I get a segfault for example when I start gnus.  Here's the
xbacktrace from gdb:

>>= gdb emacs
GNU gdb (GDB) 8.2.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from emacs...done.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from 
terminal]
DISPLAY = :0
TERM = xterm-256color
Breakpoint 1 at 0x111cef: file emacs.c, line 370.
Temporary breakpoint 2 at 0x12a7f1: file sysdep.c, line 1095.
(gdb) run
Starting program: /home/horn/Repos/el/emacs/src/emacs 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffeea70700 (LWP 25211)]
[Detaching after vfork from child process 25212]
[New Thread 0x7fffee22d700 (LWP 25213)]
[New Thread 0x7fffed2b2700 (LWP 25214)]
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Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
0x000055bc33060af0 in ?? ()
(gdb) xbacktrace
"insert-file-contents" (0xffffaee8)
"eieio-persistent-read" (0xffffb178)
"gnus-registry-read" (0xffffb390)
"gnus-registry-load" (0xffffb5f0)
"gnus-registry-initialize" (0xffffb7c0)
"eval-buffer" (0xffffbab0)
"load-with-code-conversion" (0xffffbd78)
"load" (0xffffc020)
"gnus-read-init-file" (0xffffc290)
"gnus-1" (0xffffc518)
"gnus" (0xffffc820)
"funcall-interactively" (0xffffc818)
"call-interactively" (0xffffca70)
"command-execute" (0xffffcd28)
0x57ad99c0 PVEC_COMPILED
"ivy-call" (0xffffd2e8)
"ivy-read" (0xffffd870)
"counsel-M-x" (0xffffdd10)
"funcall-interactively" (0xffffdd08)
"call-interactively" (0xffffde50)
"command-execute" (0xffffe0f8)
(gdb) 

Bye,
Tassilo