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bug#54183: 28.0.91; Emacs crashes on bookmark-jump
From: |
Gustavo Barros |
Subject: |
bug#54183: 28.0.91; Emacs crashes on bookmark-jump |
Date: |
Mon, 28 Feb 2022 08:01:00 -0300 |
User-agent: |
mu4e 1.6.10; emacs 28.0.91 |
Hi Eli,
On Mon, 28 Feb 2022 at 05:24, Eli Zaretskii <eliz@gnu.org> wrote:
Sure, I will try to help.
Thanks, I'll try my best here too.
Can you describe step by step what you did to try to run Emacs under
GDB?
And btw, did I understand correctly that you can reproduce the problem
in a standalone Emacs process (i.e. not when Emacs is run as a
daemon)? If so, try that first: it is easier that way. Just start
GDB and then run Emacs from GDB.
No, the contrary is the case: it does *not* occur on a stand alone
Emacs, only in a daemon/client instance. Indeed, it turns out I was
able to run a standalone Emacs from GDB as you say, but not the daemon.
Hence, to the steps I followed.
The first important thing I found out in attempting a second time is
that the first try was bound not to work since I usually install, then
run `make clean', and thus my binary was no longer there. So I started
the build process anew. First, I tried to run configure with the
options I use, plus those options/flags suggested at `etc/DEBUG'. But I
seemed that `make' would take some good hours with them, so I
provisionally dropped the added options/flags, to see if I could get
things running somehow. So I went with:
#+begin_src bash
./configure --with-mailutils --with-xwidgets --with-modules
--with-native-compilation
make
#+end_src
I did setup a `~/.gdbinit' file with an appropriate
`add-auto-load-safe-path /path/to/emacs/src/.gdbinit' which, as far as I
can tell, works as intended.
I went to `src/' and from there ran `./emacs'. Then I opened an
arbitrary C file in the same directory (just to get the
default-directory right, as suggested in etc/DEBUG). Then I called `M-x
gdb RET gdb -i=mi ./emacs RET'. With this, I was able to start `gdb'
for the first time without obvious warning messages.
Then I called `run RET' from the gdb prompt. That spawned me a new
Emacs instance, presumably the one we are interested in. I still don't
know what to do with it, and how to get the information we need. But,
one step at a time, since this is a standalone Emacs instance and, as
mentioned, the issue only occurs on a daemon/client instance, I went
about to get a similar procedure to work for it.
The best idea I had in this regard what to try to do something similar
to a call to `emacsclient'. So I moved to a file in the `lib-scr/'
directory, where the `emacsclient' binary is, and tried:
#+begin_example
M-x gdb RET gdb -i=mi './emacsclient -c -a=""' RET
#+end_example
and some variations thereof I could conceive. But, alas, none which did
not result in obvious errors.
The other thing I tried was the other way around. To use your
expression, to "attach GDB to the running Emacs". So, from `/lib-src/'
I started `./emacsclient -c -a=""'. I presumed I'd be able to do it
attach to it with the PID. So I tried `M-x gdb RET gdb -i=mi -p <emacs
pid> RET'. But got the below as response:
#+begin_example
Attaching to process 979203
Could not attach to process. If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see
/etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
#+end_example
So I tried (true, not very hopeful of it) `M-x gdb RET sudo gdb -i=mi -p
<emacs pid> RET'. But even if I type my password correctly, it does not
go through, and GDB exits after "3 incorrect password attempts".
I think that is a fair short summary of the "most promising" attempts I
made. I hope it is sufficient for you to spot where I stumbled, and not
too boring for you to point me in the right direction.
Best regards,
Gustavo.
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Gustavo Barros, 2022/02/27
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Eli Zaretskii, 2022/02/27
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Gustavo Barros, 2022/02/27
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Eli Zaretskii, 2022/02/27
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump,
Gustavo Barros <=
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Eli Zaretskii, 2022/02/28
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Gustavo Barros, 2022/02/28
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Eli Zaretskii, 2022/02/28
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Gustavo Barros, 2022/02/28
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Eli Zaretskii, 2022/02/28
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Eli Zaretskii, 2022/02/28
- bug#54183: 28.0.91; Emacs crashes on bookmark-jump, Gustavo Barros, 2022/02/28