bug#49864: 28.0.50; Fails to start after "make install"

[Wilhelm Kirschbaum <wkirschbaum@gmail.com>]

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It did not go exactly as the above, but adding the whole log here in case
it helps, as I am not 100% sure if I did it correctly; will go over it
again later in today.

~/src/tools/emacs/src $ gdb /usr/local/bin/emacs-28.0.50
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Reading symbols from /usr/local/bin/emacs-28.0.50...
warning: File "/home/wilhelm/src/tools/emacs/src/.gdbinit" auto-loading has
been declined by your `auto-load safe-path' set to
"$debugdir:$datadir/auto-load".
To enable execution of this file add
add-auto-load-safe-path /home/wilhelm/src/tools/emacs/src/.gdbinit
line to your configuration file "/home/wilhelm/.gdbinit".
To completely disable this security protection add
set auto-load safe-path /
line to your configuration file "/home/wilhelm/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the
shell:
info "(gdb)Auto-loading safe path"
(gdb) source ./.gdbinit
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from
terminal]
DISPLAY = :0.0
TERM = xterm-256color
Breakpoint 1 at 0x4766c: file emacs.c, line 399.
Breakpoint 2 at 0x105420: file xterm.c, line 10258.
(gdb) break pdumper.c:5315
Breakpoint 3 at 0x19959d: file pdumper.c, line 5315.
(gdb) r -Q
Starting program: /usr/local/bin/emacs-28.0.50 -Q
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".

Breakpoint 3, dump_do_dump_relocation (dump_base=<optimized out>,
reloc=...) at pdumper.c:5315
5315 if (installation_state == UNKNOWN)
(gdb) p cu_file1
$1 = XIL(0x7ffff08e4bac)
(gdb) xstring
$2 = (struct Lisp_String *) 0x7ffff08e4ba8
"../lib/emacs/28.0.50/native-lisp/28.0.50-864bf4e5/preloaded/window-0d1b8b93-dcb2375f.eln"
(gdb) p cu_file2
$3 = XIL(0x7ffff08e4b8c)
(gdb) xstring
$4 = (struct Lisp_String *) 0x7ffff08e4b88
"../native-lisp/28.0.50-864bf4e5/preloaded/window-0d1b8b93-dcb2375f.eln"
(gdb) n
5317    eln_fname = make_uninit_string (execdir_len + fn1_len);
(gdb) n
5318    fndata = SSDATA (eln_fname);
(gdb) n
5319    memcpy (fndata, emacs_execdir, execdir_len);
(gdb) n
1561  return XSTRING (string)->u.s.data;
(gdb) n
5321    if (file_access_p (fndata, F_OK))
(gdb) p fndata
$5 = <optimized out>
(gdb) next
5325 eln_fname = make_uninit_string (execdir_len + fn2_len);
(gdb) p errno
'errno' has unknown type; cast it to its declared type
(gdb) n
5326 fndata = SSDATA (eln_fname);
(gdb) n
5327 memcpy (fndata, emacs_execdir, execdir_len);
(gdb) n
1561  return XSTRING (string)->u.s.data;
(gdb) n
5329 installation_state = LOCAL_BUILD;
(gdb) p fndata
$6 = <optimized out>
(gdb) n
5331    fixup_eln_load_path (eln_fname);
(gdb) n
5352 comp_u->file = eln_fname;
(gdb) p eln_fname
$7 = XIL(0x555555c2bcb4)
(gdb) xstring
$8 = (struct Lisp_String *) 0x555555c2bcb0
"/usr/local/libexec/emacs/28.0.50/x86_64-pc-linux-gnu/../../../../bin/../native-lisp/28.0.50-864bf4e5/preloaded/window-0d1b8b93-dcb2375f.eln"
(gdb) n
1561  return XSTRING (string)->u.s.data;
(gdb) n
5354 if (!comp_u->handle)
(gdb) n
5356    fprintf (stderr, "Error using execdir %s:\n",
(gdb) n
Error using execdir
/usr/local/libexec/emacs/28.0.50/x86_64-pc-linux-gnu/../../../../bin/:
5358    error ("%s", dynlib_error ());
(gdb) p errno
'errno' has unknown type; cast it to its declared type
(gdb) n
emacs:
/usr/local/libexec/emacs/28.0.50/x86_64-pc-linux-gnu/../../../../bin/../native-lisp/28.0.50-864bf4e5/preloaded/window-0d1b8b93-dcb2375f.eln:
cannot open shared object file: No such file or directory
[Inferior 1 (process 4129) exited with code 01]
(gdb) q

On Thu, Aug 5, 2021 at 9:59 AM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Wilhelm Kirschbaum <wkirschbaum@gmail.com>
> > Date: Thu, 5 Aug 2021 09:14:10 +0200
> > Cc: 49864@debbugs.gnu.org
> >
> > Yes, of course, but I will only be able to do it a bit later today. I am
> not too familiar with GDB though.
>
> Thanks.  The instructions are below:
>
>   $ cd /home/wilhelm/src/tools/emacs/src
>   $ gdb /usr/local/bin/emacs-28.0.50
>   ...
>   (gdb) source ./.gdbinit
>   (gdb) break pdumper.c:5315
>   (gdb) r -Q
>
> When GDB announces that the breakpoint at pdumper.c:5315 breaks, do
> this:
>
>   (gdb) p cu_file1
>   (gdb) xstring
>   (gdb) p cu_file2
>   (gdb) xstring
>
> and show the results of these commands.  Then step through the code,
> one line at a time, with the "n" ("next") command.  Eventually, you
> should get to line 5321:
>
>   5321                if (file_access_p (fndata, F_OK))
>
> Then show the value of fndata, which should be a file name:
>
>   (gdb) p fndata
>
> Type "next" again.  If the file_access_p call fails (returns 'false'),
> show the value of errno immediately after stepping past the line that
> calls file_access_p:
>
>   (gdb) p errno
>
> In that case (if file_access_p fails), the "next" command will land
> you in this block:
>
>             else
>               {
>                 eln_fname = make_uninit_string (execdir_len + fn2_len);
>                 fndata = SSDATA (eln_fname);
>                 memcpy (fndata, emacs_execdir, execdir_len);
>                 memcpy (fndata + execdir_len, SSDATA (cu_file2), fn2_len);
>                 installation_state = LOCAL_BUILD;
>               }
>
> Please type "n" ("next") repeatedly until you get to the last line,
> which starts with "installation_state =", and show the value of
> fndata:
>
>   (gdb) p fndata
>
> Finally, keep stepping with "n" until you come to this line:
>
>         comp_u->handle = dynlib_open (SSDATA (eln_fname));
>
> and type the following commands:
>
>   (gdb) p eln_fname
>   (gdb) xstring
>
> and show their results.
>
> You can then terminate the GDB session:
>
>   (gdb) q
>
> (Answer "y" if it asks whether to quit.)
>
> I hope the data you collect and report will explain what happens, or
> at least give us a direction in which to look for the explanation.
>
> Thanks again for your help in this matter.
>

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